Document version auto-increment and fix typos. (#1039)

* Document version auto-increment and fix typos.

Signed-off-by: dblock <dblock@amazon.com>

* Updated to clarify releasing major, minor and patch.

Signed-off-by: dblock <dblock@amazon.com>

---------

Signed-off-by: dblock <dblock@amazon.com>

RELEASING.md

@@ -4,6 +4,12 @@
   - [Feature Branches](#feature-branches)
 - [Release Labels](#release-labels)
 - [Releasing](#releasing)
+  - [Releasing New Versions](#releasing-new-versions)
+    - [Releasing a Patch (v2.10.5)](#releasing-a-patch-v2105)
+    - [Releasing a new Minor Version (v2.11.0)](#releasing-a-new-minor-version-v2110)
+    - [Releasing a new Major Version (v3.0.0)](#releasing-a-new-major-version-v300)
+  - [Automated Release](#automated-release)
+  - [CHANGELOG Entries](#changelog-entries)
 
 ## Overview
 
@@ -13,28 +19,79 @@ This document explains the release strategy for artifacts in this organization.
 
 ### Release Branching
 
-Given the current major release of 1.0, projects in this organization maintain the following active branches.
+Given the next major release of 3.0, current major release of 2.x, and latest minor release of 2.10, this project maintains the following active branches.
 
-* **main**: The next _major_ release. This is the branch where all merges take place and code moves fast.
-* **1.x**: The next _minor_ release. Once a change is merged into `main`, decide whether to backport it to `1.x`.
-* **1.0**: The _current_ release. In between minor releases, only hotfixes (e.g. security) are backported to `1.0`.
+* **main**: The next _major_ release, e.g. `3.0.0`. This is the branch where all merges take place and code moves fast.
+* **2.x**: The next _minor_ release, e.g. `2.11.0`. Once a change is merged into `main`, decide whether to backport it to `2.x`.
+* **2.10**: The _next_ patch release, e.g. `2.10.5`. In between minor releases, only hotfixes (e.g. security) are backported to `2.10`.
 
-Label PRs with the next major version label (e.g. `2.0.0`) and merge changes into `main`. Label PRs that you believe need to be backported as `1.x` and `1.0`. Backport PRs by checking out the versioned branch, cherry-pick changes and open a PR against each target backport branch.
+PRs go into `main`. Label PRs that you need to be backported as `backport 2.x`. Backport PRs by checking out the versioned branch, cherry-pick changes and open a PR against each target backport branch.
 
 ### Feature Branches
 
-Do not creating branches in the upstream repo, use your fork, for the exception of long lasting feature branches that require active collaboration from multiple developers. Name feature branches `feature/<thing>`. Once the work is merged to `main`, please make sure to delete the feature branch.
+Do not create branches in the upstream repo, use your fork, for the exception of long lasting feature branches that require active collaboration from multiple developers. Name feature branches `feature/<thing>`. Once the work is merged to `main`, please make sure to delete the feature branch.
 
 ## Release Labels
 
-Repositories create consistent release labels, such as `v1.0.0`, `v1.1.0` and `v2.0.0`, as well as `patch` and `backport`. Use release labels to target an issue or a PR for a given release. See [MAINTAINERS](MAINTAINERS.md#triage-open-issues) for more information on triaging issues.
+Repositories create consistent release labels, such as `v1.0.0`, `v1.1.0` and `v2.0.0`. Use release labels to target an issue or a PR for a given release. See [MAINTAINERS](MAINTAINERS.md#triage-open-issues) for more information on triaging issues.
 
 ## Releasing
 
+### Releasing New Versions
+
 The release process is standard across repositories in this org and is run by a release manager volunteering from amongst [MAINTAINERS](MAINTAINERS.md).
 
-1. Create a tag, e.g. `v2.1.0`, and push it to the GitHub repo.
-1. The [release-drafter.yml](.github/workflows/release-drafter.yml) will be automatically kicked off and is responsible for drafting a new release on GitHub containing release artifacts.
-1. Before creating a draft release, this workflow creates a GitHub issue asking for approval from the [maintainers](MAINTAINERS.md). See sample [issue](https://github.com/gaiksaya/opensearch-java/issues/1). The maintainers need to approve in order to continue the workflow run.
-1. Once a release is drafted [opensearch-java-maven-sign-and-release/](https://build.ci.opensearch.org/job/opensearch-java-maven-sign-and-release/) jenkins workflow is triggered. The artifacts will be automcatically signed and published to maven.
-1. Increment `systemProp.version` in [gradle.properties](gradle.properties) to the next patch release, e.g. `v2.1.1`, commit and push. 
+Assuming the following current state.
+
+1. `2.10`: next patch, i.e. `2.10.5-SNAPSHOT`
+2. `2.x`: next minor, i.e. `2.11.0-SNAPSHOT`
+3. `main`: next major, i.e. `3.0.0-SNAPSHOT`
+
+#### Releasing a Patch (v2.10.5)
+
+1. Check out `2.10`.
+2. Ensure `systemProp.version` in [gradle.properties](gradle.properties) matches the version being released, i.e. `2.10.5`.
+3. Replace `## [Unreleased x.y]` with `## [2.10.5] - 06/20/2024` in [CHANGELOG](CHANGELOG.md).
+4. Commit changes to `gradle.properties` and [CHANGELOG](CHANGELOG.md).
+5. Create a tag, `v2.10.5`, and push your changes and the new tag to GitHub. An automated release will be made.
+6. An [increment version workflow](.github/workflows/increment-version.yml) will make a pull request to set `systemProp.version` in [gradle.properties](gradle.properties) to `2.10.6` in the `2.10` branch.
+
+#### Releasing a new Minor Version (v2.11.0)
+
+1. Check out `2.x`.
+2. Ensure `systemProp.version` in [gradle.properties](gradle.properties) matches the version being released, i.e. `2.11.0`.
+3. Replace `## [Unreleased x.y]` with `## [2.11.0] - 06/20/2024` in [CHANGELOG](CHANGELOG.md).
+4. Commit changes to `gradle.properties` and [CHANGELOG](CHANGELOG.md).
+5. Create a tag, `v2.11.0`, and push your changes and the new tag to GitHub. An automated release will be made.
+6. Create a branch, `2.11`, set `systemProp.version` in [gradle.properties](gradle.properties) to `2.11.1`, and push the new branch to GitHub.
+7. An [increment version workflow](.github/workflows/increment-version.yml) will make a pull request to set `systemProp.version` in [gradle.properties](gradle.properties) to `2.12.0` in the `2.x` branch.
+
+#### Releasing a new Major Version (v3.0.0)
+
+1. Check out `main`.
+2. Ensure `systemProp.version` in [gradle.properties](gradle.properties) matches the version being released, i.e. `3.0.0`.
+3. Replace `## [Unreleased x.y]` with `## [3.0.0] - 06/20/2024` in [CHANGELOG](CHANGELOG.md).
+4. Commit changes to `gradle.properties` and [CHANGELOG](CHANGELOG.md).
+5. Create a tag, `v3.0.0`, and push your changes and the new tag to GitHub. An automated release will be made.
+6. Create a branch, `3.0`, set `systemProp.version` in [gradle.properties](gradle.properties) to `3.0.1`, and push the new branch to GitHub.
+7. Create a branch, `3.x`, set `systemProp.version` in [gradle.properties](gradle.properties) to `3.1.0`, and push the new branch to GitHub.
+8. An [increment version workflow](.github/workflows/increment-version.yml) will make a pull request to set `systemProp.version` in [gradle.properties](gradle.properties) to `4.0.0` in the `main` branch.
+
+### Automated Release
+
+The [release-drafter workflow](.github/workflows/release-drafter.yml) will be automatically kicked off and is responsible for drafting a new release on GitHub containing release artifacts. Before creating a draft release, this workflow creates a GitHub issue asking for approval from the [maintainers](MAINTAINERS.md). See sample [issue](https://github.com/gaiksaya/opensearch-java/issues/1). The maintainers need to approve in order to continue the workflow run. Once a release is drafted [opensearch-java-maven-sign-and-release](https://build.ci.opensearch.org/job/opensearch-java-maven-sign-and-release/) Jenkins workflow is triggered. The artifacts will be automatically signed and published to maven.
+
+### CHANGELOG Entries
+
+The unreleased section in [CHANGELOG](CHANGELOG.md) should look like so.
+
+```markdown
+## [Unreleased 2.x]
+### Added
+### Dependencies
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+```