[PATCH STABLE] doc: use "tag" revset predicate instead of "tagged" for example in help

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1358954482 -32400
# Branch stable
# Node ID b347cdffcf48ab6473e0949b7816bdb64c50da21
# Parent  a2e9fe93d9eaba4ad2727d6bcde3afe3985ac00b
doc: use "tag" revset predicate instead of "tagged" for example in help

"tagged" predicate is officially described in help, but "tagged" is
not, even though the latter works as same as the former.

diff --git a/mercurial/help/revsets.txt b/mercurial/help/revsets.txt
--- a/mercurial/help/revsets.txt
+++ b/mercurial/help/revsets.txt
@@ -118,4 +118,4 @@
 - Changesets mentioning "bug" or "issue" that are not in a tagged
   release::
 
-    hg log -r "(keyword(bug) or keyword(issue)) and not ancestors(tagged())"
+    hg log -r "(keyword(bug) or keyword(issue)) and not ancestors(tag())"