chore: shorten PR2 change file comments

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bsunderhus

change/@fluentui-priority-overflow-pr2-subscribe.json

@@ -1,6 +1,6 @@
 {
   "type": "minor",
-  "comment": "feat: OverflowManager now exposes getSnapshot and subscribe so consumers can subscribe directly to overflow state without forcing intermediate re-renders.",
+  "comment": "feat: expose getSnapshot and subscribe on OverflowManager",
   "packageName": "@fluentui/priority-overflow",
   "email": "bsunderhus@microsoft.com",
   "dependentChangeType": "patch"

change/@fluentui-react-overflow-pr2-subscribe.json

@@ -1,6 +1,6 @@
 {
   "type": "patch",
-  "comment": "fix: each overflow hook (useOverflowCount, useIsOverflowItemVisible, useIsOverflowGroupVisible, useOverflowVisibility) now subscribes to the manager snapshot directly so the Overflow container no longer holds intermediate state. itemVisibility, groupVisibility and hasOverflow on the context are kept for backward compatibility but are now deprecated.",
+  "comment": "fix: subscribe overflow hooks directly to the manager snapshot",
   "packageName": "@fluentui/react-overflow",
   "email": "bsunderhus@microsoft.com",
   "dependentChangeType": "patch"