Metadata: update spec example to 'Video'
Metadata: update spec example to 'Video'

Change-Id: Ic675725ed4232e4920d6ada3770a0ba4f467027a

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps