update docs

Author: elringus

docs/en/releases/1.21.md

@@ -211,3 +211,4 @@ Most fixes associated with bugs found during the pre-release stage are backporte
 - `2026-07-14` Fixed inconsistent text reveal speed due to lost frame time fractions.
 - `2026-07-15` Fixed Story Editor crashing the Unity editor when Domain Reload is enabled.
 - `2026-07-17` Fixed some default UIs having incorrect font configuration causing issues when changing localization.
+- `2026-07-19` Fixed errors when deinitializing the engine while some services are not initialized completely.