## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES
## What kind of change does this PR introduce?
docs update
## What is the new behavior?
Adds PostgREST mirror codes
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Added a comprehensive PostgREST Error Codes guide covering database-
and API-level errors, HTTP status mappings, JSON examples, SQL query
samples, and log-analysis/debugging tips.
* Updated REST API Guides navigation to include the new Error Codes
documentation link.
* **Style**
* Expanded spelling allow-list to include "Grantor" (case variant) and
"SQL".
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Chris Chinchilla <chris.ward@supabase.io>
