help is misleading / ambiguous around what args are accepted for "KEY"

[wwade]

For example, the following is entirely valid:

job ls /tmp/foo
job -B foo true

But the help says things like:

  -k KEY, --key KEY     Specify job key to use (must be unique among active jobs)
  -b KEY, --blocked-by KEY
                        Specify that this job depends on the job specified by KEY

When in fact, it takes just a job reference of some kind which can be a substring of a current or recent job's command line OR a fully-qualified job key.