Summary

The architecture documentation in src/docs/arch-cursor.dox (line 183) incorrectly states that WT_CONNECTION_IMPL->backup.start (formerly hot_backup_start) "can only be accessed when the connection schema lock is held." The field is actually guarded by backup.lock (the hot backup read-write lock), not the schema lock.

Fix

Update the sentence to reference backup.lock instead of the schema lock.

Context

Spotted during review of PR #13793 (WT-17531). The inaccuracy predates that PR and was not introduced by it.