[PATCH] Reword description of SXID_* tunable properties

[Florian Weimer]

* Siddhesh Poyarekar via Libc-alpha:

> The SXID_* tunable properties only influence processes that are
> AT_SECURE, so make that a bit more explicit in the documentation and
> comment.
>
> Revisiting the code after a few years I managed to confuse myself, so
> I imagine there could be others who may have incorrectly assumed like
> I did that the SXID_ERASE tunables are not inherited by children of
> non-AT_SECURE processes.

Change looks reasonable.  It reflects how I think the implementation
works, but I have not checked whether my assumptions match reality.

Thanks,
Florian
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