[wwwdocs] Document SPARC changes in upcoming 7.2 release

[Eric Botcazou]

Applied to the wwwdocs module.

-- 
Eric Botcazou
Index: gcc-7/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-7/changes.html,v
retrieving revision 1.87
diff -u -r1.87 changes.html
--- gcc-7/changes.html	15 Jul 2017 16:51:18 -0000	1.87
+++ gcc-7/changes.html	17 Jul 2017 13:23:46 -0000
@@ -1231,7 +1231,6 @@
 are not listed here).</p>
 
 <!-- .................................................................. -->
-<!--
 <h2><a name="7.2">GCC 7.2</a></h2>
 
 <p>This is the <a href="https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&amp;resolution=FIXED&amp;target_milestone=7.2";>list
@@ -1242,6 +1241,14 @@
 
 <h3>Target Specific Changes</h3>
 
+<h4>SPARC</h4>
+  <ul>
+    <li>Support for the SPARC M8 processor has been added.</li>
+    <li>The switches <code>-mfix-ut700</code> and <code>-mfix-gr712rc</code>
+        have been added to work around an erratum in LEON3FT processors.</li>
+  </ul>
+
+<!--
 <h4>IA-32/x86-64</h4>
   <ul>
     <li>The argument order of <code>_subborrow_u32</code> and