Remove Media as option to select in Language Processing

[jeffpaul]

Is your enhancement related to a problem? Please describe.
In the Language Processing settings (for IBM Watson NLU) we present an option to classify Media. As best I can tell NLU only works on text and not media.

Describe the solution you'd like
Remove the option to try and classify Media (aka the Attachment post type) in the Language Processing section.

Designs

Describe alternatives you've considered
Keep as-is in case there's a legitimate case for Language Processing to run on Media/Attachments?

Additional context
n/a