add 64-bit windows registry location

doc/autoupdate.rst

@@ -61,9 +61,10 @@ update check mechanism whereas the second method prevents any manual overrides.
 
 To prevent automatic updates, but allow manual overrides:
 
-1. Migrate to the following directory::
+1. Migrate to the following directory:
 
-	HKEY_LOCAL_MACHINE\Software\ownCloud\ownCloud
+    a. (32-bit) ``HKEY_LOCAL_MACHINE\Software\ownCloud\ownCloud``
+    b. (64-bit) ``HKEY_LOCAL_MACHINE\Software\Wow6432Node\ownCloud\ownCloud``
 
 2. Add the key ``skipUpdateCheck`` (of type DWORD).