8.0.0-alpha1 BC3 release note update (#76123)
8.0.0-alpha1 BC3 release note update (#76123)

Co-authored-by: James Rodewig <d5d520df3f4564540f208acb32a86e5e141e7431@users.noreply.github.com>
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch