[committed] libstdc++: Update C++17 status table for <charconv>

[Jonathan Wakely]

On 01/02/21 16:08 +0000, Jonathan Wakely wrote:
>libstdc++-v3/ChangeLog:
>
>	* doc/xml/manual/status_cxx2011.xml: Update std::call_once
>	status.
>	* doc/xml/manual/status_cxx2014.xml: Likewise.
>	* doc/xml/manual/status_cxx2017.xml: Likewise. Update
>	std::from_chars and std::to_chars status. Fix formatting.
>	* doc/html/manual/status.html: Regenerate.

I noticed we have an unwanted extra column at the right of the
C++11/14/17 tables, due to a stray <entry/> element. Fixed by this
patch.

Committed to trunk.


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