Adding a registration for H.263#417

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Yahweasel wants to merge 2 commits intow3c:mainfrom

Commits on Dec 3, 2021

Adding a registration for H.263.
Yahweasel
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Commits on Dec 8, 2021

Avoiding reserved "must" and "may" by using synonyms "needs to" and "can"
Yahweasel
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