[media] extended-controls.rst: fix typo

Fix a typo on a word inside it.
Signed-off-by: NAndrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -2846,7 +2846,7 @@ JPEG Control IDs
     input image is sampled, in respect to maximum sample rate in each
     spatial dimension. See :ref:`itu-t81`, clause A.1.1. for more
     details. The ``V4L2_CID_JPEG_CHROMA_SUBSAMPLING`` control determines
-    how Cb and Cr components are downsampled after coverting an input
+    how Cb and Cr components are downsampled after converting an input
     image from RGB to Y'CbCr color space.
 
 .. tabularcolumns:: |p{7.0cm}|p{10.5cm}|