[screen-orientation] Comments from Marcos

[Arthur Barstow]

FYI, Marcos provided some comments on the latest Screen Orientation API 
ED in <https://github.com/w3ctag/spec-reviews/issues/7>.

Marcos - thanks for this. Is your expectation that followups on your 
review are made in GH or WebApps' list? (My preference is the list, 
unless there is some specific `Web Architecture` / TAG issue.)

-AB