doc: add added: information for process

Most of the information is gleaned from changelogs. The rest is inferred from git history. Omitted cpuUsage() since it's not yet in a release. Also omitted the streams, events and signals, since I didn't really think it made sense for those. Ref: #6578 PR-URL: #6589 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Stephen Belanger <[email protected]> Reviewed-By: Alexander Makarenko <[email protected]>

Author: bengl