6.0 docs: HTTP/3 in ASP.NET Core

[JamesNK]

What is the usability of HTTP/3 with ASP.NET Core in 5.0? If we intend for people to try it out with 5.0 it should have docs.

@jkotalik

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[jkotalik]

I have a draft of the doc/blog post in specs; I'll update it accordingly.

[wtgodbe]

Add this info to the docs: #34858 (comment)