[Bug c++/81140] Update docs to reflect P0612R0: clarify meaning of "volatile access" + that it includes any glvalue

[db0451 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81140

DB <db0451 at gmail dot com> changed:

           What    |Removed                     |Added
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           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=33053

--- Comment #2 from DB <db0451 at gmail dot com> ---
yup: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33053