help kill should also mention man kill

[Dan Jacobson]

Incompatibility: one verbose, one not.
$ kill -1 1812 1818 1825 1826 1857
bash: kill: (1812) - No such process
bash: kill: (1818) - No such process...
$ /bin/kill -1 1812 1818 1825 1826 1857
$

Or at least also mention /bin/kill here
$ help kill
    ...Kill is a shell builtin for two reasons...

$ man kill mentions to see also the shell's builtin, but bash doesn't
return the favor.