Add release notes for long string overlay fix

Author: khanak0509

packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md

@@ -35,7 +35,7 @@ TODO: Remove this section if there are not any updates.
 
 ## Debugger updates
 
-TODO: Remove this section if there are not any updates.
+- Fixed an issue where long string values in the console/variables view would overflow and overlap with other elements. [#7112](https://github.com/flutter/devtools/issues/7112)
 
 ## Network profiler updates