doc: update list of gccgo import search paths

R=iant
CC=golang-dev
https://golang.org/cl/38560043

doc/gccgo_install.html

@@ -291,9 +291,9 @@ first one that it finds.
 
 <ul>
 <li><code><var>FILE</var>.gox</code>
-<li><code><var>FILE</var>.o</code>
 <li><code>lib<var>FILE</var>.so</code>
 <li><code>lib<var>FILE</var>.a</code>
+<li><code><var>FILE</var>.o</code>
 </ul>
 
 <p>