Docs: Updated migration guide. [skip ci]

Author: psmyrek

docs/updating/update-to-45.md

@@ -16,14 +16,16 @@ modified_at: 2025-05-08
 
 ## Update to CKEditor 5 v45.2.1
 
-Released on June 17, 2025. ([See full release notes](https://github.com/ckeditor/ckeditor5/releases/tag/v45.2.1))
+Released on June 23, 2025. ([See full release notes](https://github.com/ckeditor/ckeditor5/releases/tag/v45.2.1))
 
 Below are the most important changes that require your attention when upgrading to CKEditor 5 v45.2.1.
 
+* Fixed editor crash that happened in a specific scenario, when editing heavily formatted text, text with multiple comments, or text with comments and formatting.
 * Fixed incorrect cache invalidation in `Mapper`, which could lead to crashes when editing heavily formatted content or when using complex features like multi-level lists.
 * Fixed editor crash that happened when typing over a table content with the balloon toolbar enabled.
 * Fixed editor crash that happened when editing deeply nested multi-level lists.
 * Improved calculation of pagination page-breaks on documents with long tables.
+* Fixed editor crash when typing over multiple selected blocks next to a code block or a block quote.
 
 ## Update to CKEditor 5 v45.2.0