[wwwdocs] Extend instructions at mirrors.html

[Gerald Pfeifer]

I realized that our instructions on how to submit a new mirror were
not complete with respect what we'd really like to get.

Updated thusly.

Gerald

Index: mirrors.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/mirrors.html,v
retrieving revision 1.179
diff -u -3 -p -r1.179 mirrors.html
--- mirrors.html	22 Mar 2008 15:33:01 -0000	1.179
+++ mirrors.html	15 Jun 2008 12:32:51 -0000
@@ -54,8 +54,9 @@ Key fingerprint = 90AA 4704 69D3 965A 87
 
 <p>If you wish to host a new mirror site, please contact
 <a href="mailto:gcc@gcc.gnu.org">gcc@gcc.gnu.org</a>.  Include the
-name of the server, the path to the GCC mirror and the country/city
-where the mirror is located.</p>
+URL of the gcc.gnu.org mirror area, the country/city where the mirror
+is located, and the e-mail address and name, if appropriate, of a
+contact for that mirror.</p>
 
 </body>
 </html>