[ttml2] update links to RFC with https (#1225)

himorin has just created a new issue for https://github.com/w3c/ttml2:

== update links to RFC with https ==
as title. Update links in references from http to https.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1225 using your GitHub account


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Received on Sunday, 7 March 2021 07:56:50 UTC