switch library reference and language reference

Doc/tools/sphinxext/indexcontent.html

@@ -9,10 +9,10 @@
          <span class="linkdescr">start here</span></p>
       <p class="biglink"><a class="biglink" href="{{ pathto("using/index") }}">Using Python</a><br/>
          <span class="linkdescr">how to use Python on different platforms</span></p>
-      <p class="biglink"><a class="biglink" href="{{ pathto("reference/index") }}">Language Reference</a><br/>
-         <span class="linkdescr">describes syntax and language elements</span></p>
       <p class="biglink"><a class="biglink" href="{{ pathto("library/index") }}">Library Reference</a><br/>
          <span class="linkdescr">keep this under your pillow</span></p>
+      <p class="biglink"><a class="biglink" href="{{ pathto("reference/index") }}">Language Reference</a><br/>
+         <span class="linkdescr">describes syntax and language elements</span></p>
       <p class="biglink"><a class="biglink" href="{{ pathto("howto/index") }}">Python HOWTOs</a><br/>
          <span class="linkdescr">in-depth documents on specific topics</span></p>
     </td><td width="50%">