strip: improve help text for --no-backup option

Help text is modified to clearly define the meaning of
--no-backup option.

Differential Revision: https://phab.mercurial-scm.org/D3886

hgext/strip.py

@@ -103,8 +103,9 b' def strip(ui, repo, revs, update=True, b'
                                'option)'), _('REV')),
           ('f', 'force', None, _('force removal of changesets, discard '
                                  'uncommitted changes (no backup)')),
-          ('', 'no-backup', None, _('no backups')),
-          ('', 'nobackup', None, _('no backups (DEPRECATED)')),
+          ('', 'no-backup', None, _('do not save backup bundle')),
+          ('', 'nobackup', None, _('do not save backup bundle '
+                                   '(DEPRECATED)')),
           ('n', '', None, _('ignored  (DEPRECATED)')),
           ('k', 'keep', None, _("do not modify working directory during "
                                 "strip")),

tests/test-strip.t

@@ -719,7 +719,7 b' Make sure no one adds back a -b option:'
                            revisions without this option)
    -f --force              force removal of changesets, discard uncommitted
                            changes (no backup)
-      --no-backup          no backups
+      --no-backup          do not save backup bundle
    -k --keep               do not modify working directory during strip
    -B --bookmark VALUE [+] remove revs only reachable from given bookmark
       --mq                 operate on patch repository