#91 check_ping syntax in --help

[Roderick Montgomery]

--help text says:

Usage: www.yahoo.com -H <host_address> -w
<wrta>,<wpl>% -c <crta>,<cpl>% [-p packets] [-t
timeout] [-L]

but my trial-and-error usage suggests that it's more
like:

Usage: <host_address> <wrta> <crta> <wpl> <cpl> [-p
packets] [-t timeout]

It looks like wrta, crta, wpl, and cpl are all
mandatory, and the --help text does not reflect their
proper syntax.

[Mei Douthitt]

Logged In: YES
user_id=81521

Code (as of version 1.2.9-4) appears to reflect the
original syntax; the latter should not work.

Example usage:

check_ping -H 192.168.0.1 -w 50,70% -c 100,90%