[PATCH 3 of 3] filelog: fix backwards comment for 'backrevref'

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at google.com>
# Date 1421084816 28800
#      Mon Jan 12 09:46:56 2015 -0800
# Node ID cb67539b4c09b8a99a26c3fdfeb3da0ed0c60d00
# Parent  896e07bfe7c627e5cb3be2ef17e13c3c3a698415
filelog: fix backwards comment for 'backrevref'

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -799,7 +799,7 @@
         files = (f for f in repo[None] if m(f))
 
     for f in files:
-        backrevref = {}  # final value for: changerev -> filerev
+        backrevref = {}  # final value for: filerev -> changerev
         lowestchild = {} # lowest known filerev child of a filerev
         delayed = []     # filerev with filtered linkrev, for post-processing
         lowesthead = None # cache for manifest content of all head revisions