MFC r343444:

[ngie]

Summary

Document that sendfile will return an invalid value for sbytes if provided an invalid address

This is meant to clarify the fact that the system call will not fail
with -1/EFAULT, as one might expect, when reading the sendfile(2)
manpage today.

While here, pet the mandoc linter, when dealing with the section that
describes valid values for flags.

PR: 232210

[jtl]

I assume this is the stable/12 version of D19150?

If so, feel free to commit with "Approved by: jtl".

[ngie]

In D19151#409812, @jtl wrote:

I assume this is the stable/12 version of D19150?

Yup!

If so, feel free to commit with "Approved by: jtl".

Will do :).