docs: update spelling and indentation mistakes

[MarkBekooy]

• Polished docs wording across relations guides to improve grammar in profile information examples.
• Fixed typo in Rule 1 guidance (reltions -> relations) in multi-part relations sections.
• Updated Rule 2 wording from min relations to main relations across dialect docs for consistency.
• Cleaned indentation in the Postgres RQB schema.ts code tab to improve readability.
• Scope is documentation-only; no runtime or API behavior changes.