Remove BUGS from aio_write(2)

[felix.the.red_gmail.com]

Summary

lib/libsys/aio_write.2: Remove BUGS section.

From the original PR:
The note "Invalid information in iocb->_aiocb_private may confuse the kernel."
is in the BUGS section. AFAICT, it's __aiocb_private, not _aiocb_private (double underscore)
which also hints strongly on a private implementation defined symbol,
which isn't documented properly (header file even says, don't touch directly).
Suggest cutting the BUGS section from aio_write(3) altogether.

PR:210468

[0mp]

Seems OK.

[0mp]

Actually, I'm not sure if this section should be removed. I posted a comment in Bugzilla about it.

At the very least, the commit message should explain why the message was there in the first place and why it is no longer needed.

[felix.the.red_gmail.com]

The BUGS section is original to lib/libsys/aio_write.2.

Why was it there? Because Wes Peters put it in there in 1999.
Why did I try to remove it? A PR.

I will wait for further instructions.