Fix typos

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,7 +3,7 @@ Thanks for contributing to Altair!
 Read the PR guidelines below and then delete this message before submitting your PR.
 
 - Describe the purpose of the changes in PR, so that it is easy to understand the implication of the suggested changes.
-    - Here is a [helpful article about writing effective PR descriptions](https://medium.com/@greenberg/writing-pull-requests-your-coworkers-might-enjoy-reading-9d0307e93da3.
-- Include unit tests and documentation for new feautres)
+    - Here is a [helpful article about writing effective PR descriptions](https://medium.com/@greenberg/writing-pull-requests-your-coworkers-might-enjoy-reading-9d0307e93da3).
+- Include unit tests and documentation for new features
 - Ensure that the title is a concise [semantic commit message](https://www.conventionalcommits.org/) (e.g. "feat: Add `embed_options` to charts").
-    - Append `!` if the change is breaking (e.g. "fix!: Error when `embed_options` is `None`")
+    - Append `!` if the change is breaking (e.g. "fix!: Raise error when `embed_options` is `None`")