Update documentation references

Update remaining documentation files to remove references to the old approval flow and feature flags.

docs/moderation/SUBMISSION_PATTERNS.md

@@ -19,8 +19,8 @@ User Form → validateEntityData() → createSubmission()
   → content_submissions table 
   → submission_items table (with dependencies)
   → Moderation Queue
-  → Approval → process-selective-approval edge function
-  → Live entities created
+  → Approval → process-selective-approval edge function (atomic transaction RPC)
+  → Live entities created (all-or-nothing via PostgreSQL transaction)
 ```
 
 **Example:**