subrepo: update the help text to account for diff -I/-X gitsubrepo support The functionality was added in a48b65ab428d.

revert: make the interactive mode experimental While fixing issue4304: "record: allow editing new files" we introduced changes in record/crecord. These changes need to be matched with changes in any command using record. Revert is one of these commands and the changes have not been made for this release. Therefore, revert -i should be an experimental feature for this release.