fix syntax error

Author: John Daggett

README.markdown

@@ -4,7 +4,7 @@ To download a copy of all specifications:
 
         hg clone http://dvcs.w3.org/hg/csswg
 
-For help setting up mercurial see instructions (here)[http://wiki.csswg.org/tools/hg/install].  Specification issues are discussed on the
+For help setting up mercurial see instructions [here](http://wiki.csswg.org/tools/hg/install).  Specification issues are discussed on the
 public [www-style mailing list](http://lists.w3.org/Archives/Public/www-style/).
 
 * [CSS Snapshot 2007](http://dev.w3.org/csswg/css-2007/)