doc: add changelogs for fs

PR-URL: #11489
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
Reviewed-By: Roman Reiss <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Italo A. Casas <[email protected]>