man page missing definition of jobspec

[Mikel Ward]

bg, fg, disown, jobs, kill, and notify take a "jobspec" as an argument.
I couldn't find a definition of "jobspec" in the man page.  (There is
one in the info documentation.)

This adds the definition just below the definition of the "jobs"
builtin.  There might be a better place for it, but it would be best
somewhere in the SHELL BUILTIN COMMANDS section, otherwise those
builtins will refer to something not documented in the current man page.

bash.jobspec.patch
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