[media] DocBook media: fix typo in V4L2_CTRL_FLAG_EXECUTE_ON_WRITE

Fix small typo (missing 'it') in the documentation for
V4L2_CTRL_FLAG_EXECUTE_ON_WRITE.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/DocBook/media/v4l/vidioc-queryctrl.xml

@@ -616,7 +616,7 @@ pointer to memory containing the payload of the control.</entry>
 	    <entry><constant>V4L2_CTRL_FLAG_EXECUTE_ON_WRITE</constant></entry>
 	    <entry>0x0200</entry>
 	    <entry>The value provided to the control will be propagated to the driver
-even if remains constant. This is required when the control represents an action
+even if it remains constant. This is required when the control represents an action
 on the hardware. For example: clearing an error flag or triggering the flash. All the
 controls of the type <constant>V4L2_CTRL_TYPE_BUTTON</constant> have this flag set.</entry>
 	  </row>