win32: update link to mailing list in readme

contrib/win32/ReadMe.html

@@ -117,7 +117,7 b' editor = whatever'
     <p>
       If you cannot find an answer to your question, please feel free
       to send mail to the Mercurial mailing list, at <a
-      href="mailto:[e-mail]">[e-mail]</a>.
+      href="mailto:[e-mail]">[e-mail]</a>.
       <b>Remember</b>, the more useful information you include in your
       report, the easier it will be for us to help you!
     </p>