chown man page: colon vs. dot

[Dan Jacobson]

The chown man page talks about colon and dot, but only colon appears
in examples. Add a clear statement about which is better, history etc.

Wait! You say it on the info page, but not a peep on the man page.
"See info page" not good enough. Add specific warning, like:
Dot is old usage, see Info page.