doc: use "tag" revset predicate instead of "tagged" for example in help
"tag" predicate is officially described in help, but "tagged" is not,
even though the latter works as same as the former.
--- a/mercurial/help/revsets.txt Wed Jan 23 11:55:39 2013 -0600
+++ b/mercurial/help/revsets.txt Thu Jan 24 00:21:22 2013 +0900
@@ -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())"