[PATCH 4 of 4 evolve-ext] evolve: improve the help message of --rev

[Laurent Charignon]

# HG changeset patch
# User Laurent Charignon <lcharignon at fb.com>
# Date 1430875240 25200
#      Tue May 05 18:20:40 2015 -0700
# Node ID c182c649eae81e38a64574329ecc904ff169542f
# Parent  dee3756a1deb516c63a961ed8d2d438bd85a0baa
evolve: improve the help message of --rev

User's are not exposed to the notion of revset, this patch makes the help
message more intelligible.

diff --git a/hgext/evolve.py b/hgext/evolve.py
--- a/hgext/evolve.py
+++ b/hgext/evolve.py
@@ -1230,7 +1230,7 @@
      ('', 'confirm', False,
         'ask for confirmation before performing the action'),
     ('A', 'any', False, 'also consider troubled changesets unrelated to current working directory'),
-    ('r', 'rev', '', 'revset to find troubles in'),
+    ('r', 'rev', '', 'solves troubles of these revisions'),
     ('a', 'all', False, 'evolve all troubled changesets in the repo '
                         '(implies any)'),
     ('c', 'continue', False, 'continue an interrupted evolution'),