Updated 01-21 to reference MPEG DASH and CMAF

[irajs]

and change SHALL/SHOULD/.. to statement of fact when they are coming to standard: SHALL -> must SHOULD -> can MAY -> can/may

• adding the section of standard that this requirement is coming from.

Also added a clause on conformance requirements for timing model (5.2.1) Updated sections 1-4 accordingly.

Please review section 1-5.2 before Wed 14 call and see if this approach is acceptable for the rest of document.

[documentbot]

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