Skabelon:Edit filter warning/doc

Usage

 * filter the number of the filter that uses this message, if several filters use it, use filter2, filter3, etc, 5 maximum.  Only visible in the AbuseFilter interface.
 * action – the type of filter. Acceptable values are warn disallow deauto block degroup.
 * friendly – yes changes the display slightly to be a little less bitey.
 * text the text of the message.