doc: update process.release
Process.release doc is severely outdated. This PR includes info about LTS releases 10 and 12.
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Process.release doc is severely outdated. This PR includes info about LTS releases 10 and 12.