media: media-ioc-g-topology.rst: fix 'reserved' sizes

The size of the reserved arrays in the documentation is wrong. Sync
this with the actual header.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/mediactl/media-ioc-g-topology.rst

@@ -211,7 +211,7 @@ desired arrays with the media graph elements.
 
        -  __u32
 
-       -  ``reserved``\ [12]
+       -  ``reserved``\ [6]
 
        -  Reserved for future extensions. Drivers and applications must set
 	  this array to zero.
@@ -334,7 +334,7 @@ desired arrays with the media graph elements.
 
        -  __u32
 
-       -  ``reserved``\ [9]
+       -  ``reserved``\ [5]
 
        -  Reserved for future extensions. Drivers and applications must set
 	  this array to zero.
@@ -390,7 +390,7 @@ desired arrays with the media graph elements.
 
        -  __u32
 
-       -  ``reserved``\ [5]
+       -  ``reserved``\ [6]
 
        -  Reserved for future extensions. Drivers and applications must set
 	  this array to zero.