Editor comments docs

[ethanpalm]

Documentation changes

Documents the comment and suggestion features in the editor.

Closes https://linear.app/mintlify/issue/DOC-254/documentation-updates-for-editor-comments-and-suggestions

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Documentation-only changes that add new pages and navigation entries; no code paths or data handling are affected.

Overview
Adds new Web Editor documentation pages for Comments and Suggestions, including usage instructions (add/reply/mention/resolve/delete comments; enable/make/accept/reject suggestions) and notes about GitHub PR summaries.

Updates docs.json navigation to surface these pages under the Web editor section.

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[rtbarnes]

couple vale nits seem valid but otherwise this looks good to me!