[C++ docs patch] PR 56544

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

the bug reminds us to update the documentation about the value of 
__cplusplus. I tentatively prepared the below, is it clear enough?

We could probably apply something to the branch too, without the 
-std=c++1y bits, thus end simply like '; or @code{201103L}, per the 2011 
C++ standard' or more verbosely say that with -std=c++1y too the value 
is 201103L.

Thanks,
Paolo.

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