Fix a typo in the release notes and remove the mention of the stable branch
Fix a typo in the release notes and remove the mention of the stable branch

(cherry picked from commit 0edd4864d2e6119d6323bd0dc88ac56ada383c5f)

kaiyou/freeposte.io,kaiyou/freeposte.io,kaiyou/freeposte.io,kaiyou/freeposte.io