Change Details

https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.21.0.md

Adapted from https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.21.0.md Depends on D10304

Adapted from https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.21.0.md Depends on D10304