Update CONTRIBUTING.md

[vadimka14]

add a dot where it is missing

Why is this change needed?

you need to follow the culture of writing

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• PR title adheres to the conventional commits standard
• PR has a changeset
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PR-Codex overview

This PR focuses on improving the clarity and consistency of the CONTRIBUTING.md documentation by correcting punctuation and formatting issues.

Detailed summary

• Updated section headers for consistency (e.g., added period after "Writing Docs").
• Added periods at the end of several guidelines for uniformity.
• Clarified the steps for running yarn changeset.
• Enhanced the instructions for publishing versions with clearer formatting.

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[sds]

Header numberings don't end with a period. From ChatGPT:

1. Clarity and Consistency: The period in “3.2” is already separating the section number from the subsection. Adding another period at the end (i.e., “3.2.”) could cause confusion, as it is redundant and unnecessary.
2. Style Guides: Common style guides, such as the Chicago Manual of Style and APA, recommend numbering headers without a trailing period unless it serves a specific purpose (e.g., in some legal or technical documents, though even these often omit the extra period).

In most cases, “3.2” without the trailing period is the correct and preferred format.

[vadimka14]

then why "3.1." and "3.3." is with dot. Then i`ll make new commit