[Bug c++/71283] Inconsistent location for C++ warning options in the manual

[sandra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71283

--- Comment #19 from sandra at gcc dot gnu.org ---
This is still an unsolved problem N years later; we still don't have all C++
warnings documented in the same place, which is surely less desirable than
having them all in one location or another.

How about just renaming the "C++ Dialect Options"/"Options Controlling C++
Dialect"
section to "Options Specific to C++", and moving all the C++-specific warning
options currently in the "Warning Options" section there?  I note that some
targets also have warning options that are documented in the respective
sections for those targets, so even if we moved the C++ warnings to the
"Warning Options" section that would still not make it a complete list of all
of them.