[Bug 232852] ps(1): Improve the exit status section of the manual page

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232852

            Bug ID: 232852
           Summary: ps(1): Improve the exit status section of the manual
                    page
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: 0mp at FreeBSD.org

As suggested by jilles in https://reviews.freebsd.org/D17146:

> This is not wrong, but perhaps some details about different types 
> of errors may be helpful, such as that nonexistent usernames in -U 
> are immediately fatal while an empty result (such as from only 
> nonexistent process IDs in -p or only existing users that do not 
> currently run any process in -U) still writes the header line (if 
> not disabled) and also returns a non-zero exit status.

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