forwarded_for documentation inaccurate

if cf.data.pre:

> NAME: forwarded_for
> COMMENT: on|off
> TYPE: onoff
> DEFAULT: on
> LOC: opt_forwarded_for
> DOC_START
> If set, Squid will include your system's IP address or name
> in the HTTP requests it forwards. By default it looks like
> this:
>
> X-Forwarded-For: 192.1.2.3
>
> If you disable this, it will appear as
>
> X-Forwarded-For: unknown
> DOC_END

1) s/your system's/clients'/

2) If you disable this, the x-forwarded-for header won't be added/
modified.

--
Mark Nottingham       mnot@yahoo-inc.com