[cxx_status] Update -std= instructions for C++20.
We merged support for -std=c++20 to the Clang 10 branch, so -std=c++2a is only needed in Clang 9 and earlier.
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We merged support for -std=c++20 to the Clang 10 branch, so -std=c++2a is only needed in Clang 9 and earlier.