[media] docs-rst: simplify c:type: cross references

Instead of using c:type:`struct foo <foo>`, use:
	struct c:type:`foo`

This patch was generated via this shell script:

	for i in `find Documentation/media -type f`; do perl -ne 'if (m/\:c\:type\:\`struct\s+(\S+)\s*\<(\S+)\>\`/) { $s=$1; $r=$2; if ($s eq $r) { s/\:c\:type\:\`struct\s+(\S+)\s*\<(\S+)\>\`/struct :c:type:`$2`/; s/struct\s+struct/struct/;  s/(struct\s+\:c\:type\:\`\S+\`)\s+structure/$1/;  }} print $_' <$i >a && mv a $i; done

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/extended-controls.rst

@@ -66,7 +66,7 @@ whether the specified control class is supported.
 
 The control array is a struct
 :c:type:`v4l2_ext_control` array. The
-:c:type:`struct v4l2_ext_control <v4l2_ext_control>` structure is very similar to
+struct :c:type:`v4l2_ext_control` is very similar to
 struct :c:type:`v4l2_control`, except for the fact that
 it also allows for 64-bit values and pointers to be passed.