[PATCH] Document C++20 library status

[Jonathan Wakely]

On 11/01/19 23:42 +0000, Jonathan Wakely wrote:
>	* doc/xml/manual/intro.xml: Include new section.
>	* doc/xml/manual/status_cxx2017.xml: Document more
>	implementation-defined properties of the library.
>	* doc/xml/manual/status_cxx2020.xml: Document C++2a status.
>	* doc/html/*: Regenerate.

P1123R0 needs no changes, so can be marked complete.

Committed to trunk.


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