[wwwdocs] Clarify and simplify how to get SVN write access

[Gerald Pfeifer]

On Tue, 8 Jul 2014, Gerald Pfeifer wrote:
> A couple of us noticed, over time, that our instructions on who
> can sponsor SVN write access and how to get it are not as clear
> as they could be.  This tries to improve that.

Further clarifications and strengthening the "Else" part based
on feedback from CGF.

Gerald

Index: svnwrite.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/svnwrite.html,v
retrieving revision 1.32
diff -u -r1.32 svnwrite.html
--- svnwrite.html	8 Jul 2014 00:15:20 -0000	1.32
+++ svnwrite.html	14 Jul 2014 08:17:19 -0000
@@ -36,14 +36,14 @@
 be sponsored by an existing maintainer (someone with "write after approval"
 is not sufficient).</p>
 
-<p>If you already have an account on sourceware.org, ask
+<p>If you already have an account on sourceware.org/gcc.gnu.org, ask
 <code>overseers@gcc.gnu.org</code> to add access to the GCC repository.
 Include the name of your sponsor and CC: her.
-Else use <a
+If you do not have an account yet, use <a
 href="http://sourceware.org/cgi-bin/pdw/ps_form.cgi">this form</a>,
 again specifying your sponsor.</p>
 
-<p>Once we have this information we will set up an account on
+<p>We will then provision you on  
 <code>gcc.gnu.org</code> and inform you by mail. At this point,
 check out a tree using the instructions below and add yourself
 to the MAINTAINERS file.  Note: Your first and last names <em>must</em>