[PATCH 2/2] manual: Document __libc_single_threaded

[Florian Weimer]

* Michael Kerrisk:

>> +@deftypevar char __libc_single_threaded
>> +@standards{GNU, sys/single_threaded.h}
>> +This variable is non-zero if the current process is definitely
>> +single-threaded.  If it is zero, the process can be multi-threaded,
>
> s/can be/may be/

Fixed.

>> +Several functions in @theglibc{} can change the value of the
>> +@code{__libc_single_threaded} variable.  For example, creating new
>> +threads using the @code{pthread_create} or @code{thrd_create} function
>> +sets the variable to false.  This can also happen directly, say via a
>
> s/directly/indirectly/ ?

Indeed, fixed.

I'll repost a V2 once there are comments on the actual code.

Thanks,
Florian