[media] DocBook: Fix a breakage at controls.xml

Some previous patch introduced this bug:

/devel/v4l/patchwork/Documentation/DocBook/controls.xml:2262: parser error : attributes construct error
	      <row id=""v4l2-mpeg-video-hor-search-range">
	                ^
/devel/v4l/patchwork/Documentation/DocBook/controls.xml:2262: parser error : Couldn't find end of Start Tag row line 2262
	      <row id=""v4l2-mpeg-video-hor-search-range">
	                ^
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/DocBook/media/v4l/controls.xml

@@ -2259,7 +2259,7 @@ VBV buffer control.</entry>
 	      </row>
 
 		  <row><entry></entry></row>
-	      <row id=""v4l2-mpeg-video-hor-search-range">
+	      <row id="v4l2-mpeg-video-hor-search-range">
 		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE</constant>&nbsp;</entry>
 		<entry>integer</entry>
 	      </row>