documentation: prepare for 3.1.7 release

(From yocto-docs rev: 5a54200a8702e473ecbbc3dbbdaa24169796c9e8)

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/sphinx-static/switchers.js

@@ -2,8 +2,8 @@
   'use strict';
 
   var all_versions = {
-    'dev': 'dev (3.2)',
-    '3.1.3': '3.1.3',
+    'dev': 'dev (3.3)',
+    '3.1.7': '3.1.7',
     '3.0.4': '3.0.4',
     '2.7.4': '2.7.4',
   };