[PATCH] dagop: fix docstring of `cutfunc`

[Jun Wu]

# HG changeset patch
# User Jun Wu <quark at fb.com>
# Date 1504468483 25200
#      Sun Sep 03 12:54:43 2017 -0700
# Node ID 75cb2afd931082496524b47b7dc0f34204b77292
# Parent  68afb88b51bb626cd25440e2df812f2306463b55
dagop: fix docstring of `cutfunc`

I was using `keepfunc`, then found `cutfunc` easier to understand. But
forgot to update the documentation. This patch fixes it.

Maybe it could be applied in-place.

diff --git a/mercurial/dagop.py b/mercurial/dagop.py
--- a/mercurial/dagop.py
+++ b/mercurial/dagop.py
@@ -103,5 +103,5 @@ def revancestors(repo, revs, followfirst
 
     If cutfunc is provided, it will be used to cut the traversal of the DAG.
-    When cutfunc(X) returns False, the DAG traversal stops - revision X and
+    When cutfunc(X) returns True, the DAG traversal stops - revision X and
     X's ancestors in the traversal path will be skipped. This could be an
     optimization sometimes.