[Bug 257964] snp(4) manual page is out of sync with the device implementation on 12.2

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257964

Felix Johnson <felix.the.red@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |felix.the.red@gmail.com
 Attachment #228305|                            |maintainer-approval?(felix.
              Flags|                            |the.red@gmail.com)

--- Comment #1 from Felix Johnson <felix.the.red@gmail.com> ---
Created attachment 228305
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228305&action=edit
snp(4) patch

Document that:
 - snp(4) can only handle egress streams (ones that originate from the host)
 - The FIONREAD ioctl no longer returns special values,
   move them to the HISTORY section
 - Device disappearance, closure, or detachment will result
   in EIO or ENXIO from read(2) or write(2) calls
 - Flow control is not supported, under BUGS

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