The detailed description of shell job control
(particularly, for the format, in which job IDs are
specified) has been missed for years.
I adopted the POSIX standard text, describing shell
job control (https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_203),
tried to make it more easy-to-read and also made
some small changes according to the actual
implementation of sh(1) in FreeBSD (i.e., it reports
suspended status as `Suspended', rather than `Stopped').
I'm not very experienced with mdoc(7) and this
is my first more-or-less big patch, so I will be
very happy if you point out my mistakes.
PR: 206284