[PATCH 1 of 2 STABLE V2] revsets: remove incorrect doc line

[Sean Farley]

# HG changeset patch
# User Sean Farley <sean at farley.io>
# Date 1461790929 25200
#      Wed Apr 27 14:02:09 2016 -0700
# Branch stable
# Node ID c94d5bcf19875b7b1b04ade9ad2bfb04f80ef1ae
# Parent  cfcd065cae29673c180892ae692e986661a4adc6
# EXP-Topic doc-only-revset
revsets: remove incorrect doc line

diff --git a/mercurial/help/revsets.txt b/mercurial/help/revsets.txt
--- a/mercurial/help/revsets.txt
+++ b/mercurial/help/revsets.txt
@@ -48,12 +48,10 @@ These are the supported infix operators:
   for n == 2, the second parent of changeset in x.
 
 ``x~n``
   The nth first ancestor of x; ``x~0`` is x; ``x~3`` is ``x^^^``.
 
-There is a single postfix operator:
-
 ``x^``
   Equivalent to ``x^1``, the first parent of each changeset in x.
 
 
 The following predicates are supported: