[PATCH 1 of 2] duplicatecopies: fix arg name and docstring

[Siddharth Agarwal]

# HG changeset patch
# User Siddharth Agarwal <sid0 at fb.com>
# Date 1364454867 25200
#      Thu Mar 28 00:14:27 2013 -0700
# Node ID 04f784d278a2b4ae3f42bb50c512e081a100246e
# Parent  d118a416965d954763279e2b462dbfc307298d57
duplicatecopies: fix arg name and docstring

While most callers do indeed use duplicatecopies with a rev and its parent,
rebase doesn't.

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -1590,9 +1590,9 @@ def forget(ui, repo, match, prefix, expl
     forgot.extend(forget)
     return bad, forgot
 
-def duplicatecopies(repo, rev, p1):
-    "Reproduce copies found in the source revision in the dirstate for grafts"
-    for dst, src in copies.pathcopies(repo[p1], repo[rev]).iteritems():
+def duplicatecopies(repo, rev, fromrev):
+    '''reproduce copies from fromrev to rev in the dirstate'''
+    for dst, src in copies.pathcopies(repo[fromrev], repo[rev]).iteritems():
         repo.dirstate.copy(src, dst)
 
 def commit(ui, repo, commitfunc, pats, opts):