Adds recommendation to add /usr/local/sbin to /usr/local/bin:/usr/local/sbin:/usr/local/bin:/Users/lyndsy/.bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/MacGPG2/bin in OSX

Author: lyndsysimon

docs/starting/install/osx.rst

@@ -50,7 +50,7 @@ line at the bottom of your ``~/.bashrc`` file
 
 .. code-block:: console
 
-    export PATH=/usr/local/bin:$PATH
+    export PATH=/usr/local/bin:/usr/local/sbin:$PATH
 
 Now, we can install Python 2.7: ::