media: media-ioc-g-topology.rst: fix interface-to-entity link description

The source_id and sink_id descriptions were the same for interface-to-entity
links. The source_id is the interface ID, not the entity ID. Fix this.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -334,7 +334,7 @@ desired arrays with the media graph elements.
 
        -  On pad to pad links: unique ID for the source pad.
 
-	  On interface to entity links: unique ID for the entity.
+	  On interface to entity links: unique ID for the interface.
 
     -  .. row 3