adding note about 2.2 not supporting windows XP anymore.

Author: Andrew Leung

source/tutorial/install-mongodb-on-windows.txt

@@ -39,6 +39,10 @@ There are three builds of MongoDB for Windows:
   newer than Windows XP. 32-bit versions of MongoDB are only intended
   for older systems and for use in testing and development systems.
 
+.. versionchanged:: 2.2
+   MongoDB does not support Windows XP. Please use a newer releases of
+   Windows such as Windows 7 to use newer versions of MongoDB.
+
 .. note::
 
    Always download the correct version of MongoDB for your