[media] pixfmt-006.rst: add missing V4L2_YCBCR_ENC_SMPTE240M

Fix missing documentation, and its cross reference.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/pixfmt-006.rst

@@ -240,6 +240,12 @@ needs to be filled in.
 
        -  Use the constant luminance BT.2020 Yc'CbcCrc encoding.
 
+    -  .. row 10
+
+       -  ``V4L2_YCBCR_ENC_SMPTE_240M``
+
+       -  Use the SMPTE 240M Y'CbCr encoding.
+
 
 
 .. _v4l2-quantization:

Documentation/media/videodev2.h.rst.exceptions

@@ -85,9 +85,7 @@ replace symbol V4L2_YCBCR_ENC_DEFAULT v4l2-ycbcr-encoding
 replace symbol V4L2_YCBCR_ENC_SYCC v4l2-ycbcr-encoding
 replace symbol V4L2_YCBCR_ENC_XV601 v4l2-ycbcr-encoding
 replace symbol V4L2_YCBCR_ENC_XV709 v4l2-ycbcr-encoding
-
-# Is this deprecated, or just a missing reference?
-replace symbol V4L2_YCBCR_ENC_SMPTE240M v4l2-ycbcr-encoding-FIXME
+replace symbol V4L2_YCBCR_ENC_SMPTE240M v4l2-ycbcr-encoding
 
 # Documented enum v4l2_quantization
 replace symbol V4L2_QUANTIZATION_DEFAULT v4l2-quantization