[Need support]: Replace em dashes with plain punctuation in docs

[TKaltofen]

What and why

Our documentation style avoids em dashes and en dashes in favor of commas, colons, parentheses, or separate sentences. Several markdown files on main still contain them. This is a pure wording cleanup, ideal as a first documentation contribution.

Pointers

Files currently containing em dashes:

• CONTRIBUTING.md
• SECURITY.md
• docs/guides/07-contribute-to-official.md
• docs/guides/09-create-feature-group.md
• docs/guides/compute-framework-patterns/06-merge-engine.md
• docs/guides/compute-framework-patterns/10-data-type-extraction.md
• docs/guides/data-operation-patterns/known-divergences.md
• docs/guides/feature-group-patterns/19-domain.md
• docs/guides/feature-group-patterns/23-streaming.md
• docs/guides/feature-group-patterns/24-realtime.md

Steps

1. Search these files for — and –.
2. Rewrite each sentence with a comma, colon, parentheses, or a period, keeping the meaning intact. Do not change code blocks' behavior.
3. Run python scripts/lint_docs.py to make sure the docs linter still passes.

Acceptance criteria

• No em or en dashes remain in the listed files.
• Sentences still read naturally; no content meaning changed.
• python scripts/lint_docs.py exits 0.

Notes

This project uses semantic versioning driven by Conventional Commits, so the PR title matters: use docs: replace em dashes with plain punctuation.

New to the project? This issue is a good entry point, we are happy to help in the comments.

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