Fix release notes for 2.0.0-rc1 version (#3418) (#3420)

This change removes some old commits from the 2.0.0-rc1 release notes. These commits were already released as part of 1.x releases.

Add back some missing type removal commits to the 2.0.0 release notes

Signed-off-by: Rabi Panda <[email protected]>

Author: opensearch-trigger-bot[bot]