emacs-w3m.info missing `w3m-filter-rules' documention

["Andrew M. Scott" <amscott1@xxxxxxxxxxxxxxxxxxx>]

The emacs-w3m.info General Variables section mentions
"w3m-filter-rules", but is missing an entry/definition for it.

`w3m-use-filter'
     Non-`nil' means use filter programs to convert web contents.  See
     also `w3m-filter-rules'.
           ^^^^^^^^^^^^^^^^
Thanks,
Andy Scott

================================================================

System Info to help track down your bug:
---------------------------------------
emacs-w3m-version
 => "1.4.130"
emacs-version
 => "GNU Emacs 22.0.50.1 (x86_64-unknown-linux-gnu, X toolkit)\n of 2006-09-14 on chlr6708"
mule-version
 => "5.0 (SAKAKI)"
system-type
 => gnu/linux
w3m-version
 => "w3m/0.5.1+cvs-1.969"
w3m-type
 => w3m-m17n
w3m-compile-options
 => ("lang=en" "m17n" "image" "color" "ansi-color" "mouse" "gpm" "menu" "cookie" "ssl" "ssl-verify" "external-uri-loader" "w3mmailer" "nntp" "ipv6" "alarm" "mark")
w3m-language
 => nil
w3m-command-arguments
 => nil
w3m-command-arguments-alist
 => nil
w3m-command-environment
 => nil
w3m-input-coding-system
 => iso-latin-1
w3m-output-coding-system
 => iso-latin-1
w3m-use-mule-ucs
 => nil