[Bug c++/70613] -fabi-version docs don't match implementation

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70613

--- Comment #2 from Jim Wilson <wilson at gcc dot gnu.org> ---
Patch posted for review here
    https://gcc.gnu.org/ml/gcc-patches/2016-04/msg00480.html