Minor change to release workflow (#1078)

## What changes are proposed in this pull request?

Instead of 'content', now we are using 'body' of the release notes.
Earlier, it was printing the heading twice. This change should fix it.

## How is this tested?

N/A

NO_CHANGELOG=true

---------

Signed-off-by: Divyansh Vijayvergia <171924202+Divyansh-db@users.noreply.github.com>

Author: Divyansh-db

.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
           RELEASE_NOTES_DIR=/tmp/release-notes
           mkdir -p "$RELEASE_NOTES_DIR"
           RELEASE_NOTES_FILE="$RELEASE_NOTES_DIR/release-notes.md"
-          git for-each-ref --format='%(contents)' ${{ github.ref }} > "$RELEASE_NOTES_FILE"
+          git for-each-ref --format='%(body)' ${{ github.ref }} > "$RELEASE_NOTES_FILE"
           echo "Release notes file: $RELEASE_NOTES_FILE"
           echo "Release notes contents:"
           cat "$RELEASE_NOTES_FILE"