[Rd] Minor typo in recent commit

[Kurt Hornik]

>>>>> Hugh Parsonage writes:

Thanks: fixed now.

Best
-k

> I believe should be February 2020 not 2010
> --- a/doc/manual/R-exts.texi
> +++ b/doc/manual/R-exts.texi
> @@ -2631,9 +2631,9 @@ not necessarily installed) on all known @R{}
> platforms.  As from @R{}
>  4.0.0 a C++ compiler will be selected only if it conforms to the 2011
>  standard (`C++11').  A minor update using footnote{The changes are linked from
>  @uref{https://isocpp.org/@/std/@/standing-documents/@/sd-6-sg10-feature-test-recommendations}.}

> -(`C++14') was published in December 2014.  The latest standard (`C++17')
> -was published in December 2017, and a further revision (`C++20') is in
> -preparation.
> +(`C++14') was published in December 2014.  A revision (`C++17') was
> +published in December 2017, and a further revision (`C++20', with many
> +new features) is scheduled for February 2010.

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