two minor fixes to glibc wiki FAQ

[Jones Syue 薛懷宗]

>> Should we remove this line "(there are exceptions, e.g. __ivaliduser)"?
>> Found this wiki faq is inconsistent with my result when compiling lpr
>> source code with recent glibc version and got a link error like this:
>>
>> /path/to/ld: lpd.o: in function `chkhost':
>> lpd.c:(.text+0x1059): undefined reference to `__ivaliduser'
>
> Right, __register_atfork is probably a good long-term replacement.

Looks good to me! Replace 'e.g. __ivaliduser' with 'e.g. __register_atfork'
is good.

> Linking to
> <https://www.kernel.org/doc/html/latest/kbuild/headers_install.html>
> perhaps makes more sense?

This link looks good to me! Thank you Florian :)

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Regards,
Jones Syue | 薛懷宗
QNAP Systems, Inc.