Fix typos, comments in <pthread.h>

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> The problem is that those __pthread functions are exported via 
> linuxthreads/sysdeps/pthread/bits/libc-lock.h and malloc/thread-m.h.
> We could move those to a common include file but I don't see directly
> an elegant way.  

Outside the linuxthreads directory they are used only in libc-lock.h.
I don't really know what the best thing to do is which is why this
problem persists.

> Shouldn't we move the declarations to libc-lock.h and only install
> libc-lock.h for those systems that need it?

Seems to be ok.

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