drm/connector: refer to CTA-861-G in the "content type" prop docs

The KMS documentation doesn't say much about the meaning of each
content type. Add a reference to the specification defining them.

Signed-off-by: Simon Ser <[email protected]>
Cc: Emmanuel Gil Peyrot <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Pekka Paalanen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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