[wwwdocs]: simplify heading for Arc port contribution intem in changes.html

[wwwdocs]: simplify heading for Arc port contribution intem in changes.html

[Joern Rennecke]

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I've changed the heading to "ARC" and put the item in its
proper alpha-sorted position to make it easier to find.

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Index: changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.9/changes.html,v
retrieving revision 1.76
diff -p -u -r1.76 changes.html
--- changes.html	7 Jul 2014 10:34:21 -0000	1.76
+++ changes.html	7 Jul 2014 16:54:35 -0000
@@ -509,6 +509,12 @@ auto incr(T x) { return x++; }
      </li>
    </ul>
 
+<h3 id="arc">ARC</h3>
+  <ul>
+    <li> A port for Synopsys Designware ARC has been contributed by
+      Embecosm and Synopsys Inc.</li>
+  </ul>
+
 <h3 id="arm">ARM</h3>
      <ul>
       <li> Use of Advanced SIMD (Neon) for 64-bit scalar computations has been
@@ -714,12 +720,6 @@ auto incr(T x) { return x++; }
     will result in a warning and will not influence code generation.</li> 
   </ul>
 
-<h3 id="arc">Synopsys Designware ARC</h3>
-  <ul>
-    <li> A port for Synopsys Designware ARC has been contributed by
-      Embecosm and Synopsys Inc.</li>
-  </ul>
-
 <!--
 <h2>Documentation improvements</h2>
 -->