docs: Document language auto-indentation rules (#63009)
This PR updates the language extension docs for syntax-based rules,
line-based rules, and context-aware alignment. It is a follow-up to
#33370.
Release Notes:
- N/A
10b2925e7cSmit Barmase committed on 8/21/2026, 10:43:42 AM· committed by GitHubparent075520b