PR libc/3606: Correcting the locale.texi documentation

[Roland McGrath]

> The bug report comment on the following part of the glibc manual.
> 
>   The glibc manual says ("Categories of Activities that Locales Affect"):
>  
>   `LC_ALL'
>        This is not an environment variable; it is only a macro that you
>        can use with `setlocale' to set a single locale for all purposes.
>        Setting this environment variable overwrites all selections by the
>        other `LC_*' variables or `LANG'.

That part of the manual was written according to an older version of the
POSIX spec.  The current library behaves according to the current spec,
which you can read on opengroup.org.  If you would like to submit patches
to correct the manual's wording, that would be great.


Thanks,
Roland