doc: update release notes for grpc metrics

updating the PendingReleaseNotes.md to mark the grpc flag's removal. Signed-off-by: Madhu Rajanna <[email protected]>
ceph · Nov 7, 2023 · 4473aaa · 4473aaa
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diff --git a/PendingReleaseNotes.md b/PendingReleaseNotes.md
@@ -2,4 +2,6 @@
 
 ## Breaking Changes
 
+- Removed the deprecated grpc metrics flag's in [PR](https://github.com/ceph/ceph-csi/pull/4225)
+
 ## Features