docs: add release notes for inspector keyboard navigation fixes (#9810)

Author: muhammadkamel

packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md

@@ -21,6 +21,9 @@ TODO: Remove this section if there are not any updates.
 
 - Deleted the option to use the legacy inspector.
   [#9782](https://github.com/flutter/devtools/pull/9782)
+- Fixed an issue where navigating the Inspector widget tree with the keyboard arrow keys did not update the selected widget in the connected Flutter app. [#9810](https://github.com/flutter/devtools/pull/9810)
+- Fixed an issue where clicking a widget row after collapsing a subtree with the left arrow key unexpectedly re-expanded the subtree. [#9810](https://github.com/flutter/devtools/pull/9810)
+- Fixed an issue where collapsing the Inspector widget tree to a single row with the left arrow key caused a loading spinner to appear instead of showing the root node. [#9810](https://github.com/flutter/devtools/pull/9810)
 
 ## Performance updates