mediatype-video-raw: add ARGB64_LE/BE and variants
Adds documentation for formats implemented in !1247 (merged). Also corrects docs for ARGB/AYUV64 (they use native endianness, not LE) and capitalizes "RGB" everywhere for consistency.
Adds documentation for formats implemented in !1247 (merged). Also corrects docs for ARGB/AYUV64 (they use native endianness, not LE) and capitalizes "RGB" everywhere for consistency.