media: Add missing JSON tags to Type
media: Add missing JSON tags to Type

See https://github.com/gohugoio/hugoDocs/issues/114

gohugoio/hugo,anthonyfok/hugo,mdhender/hugo,mdhender/hugo,mdhender/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,anthonyfok/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,mdhender/hugo,anthonyfok/hugo