#13819: docs: fix FAQ heading punctuation

## Summary\n- Fix FAQ headings and matching links to use proper punctuation and apostrophes.\n\n## Testing\n- Not run (docs-only).\n\n## AI Assistance\n- AI-assisted: yes (Codex).\n- Prompt: "Fix FAQ headings punctuation and apostrophes to match the ToC."\n- I reviewed and understand the changes. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates `docs/help/faq.md` headings and corresponding table-of-contents entries to use standard punctuation (apostrophes, colons, question marks) so the visible headings read more naturally and match the ToC text. No runtime code paths are affected; the changes are isolated to documentation content and anchor links within the FAQ. <h3>Confidence Score: 3/5</h3> - Docs-only change, but likely to break FAQ section anchor links in Mintlify due to punctuation in headings. - The edits are limited to `docs/help/faq.md`, but they introduce apostrophes/colon/question marks in headings while relying on stable anchor slugs; repository docs guidance explicitly warns this breaks Mintlify anchors, so the ToC and deep links may stop working unless slugs are verified/updated. - docs/help/faq.md <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->