Adding a generic mapping example in wiki on <Plug>(GrepperOperator) flags setting

Hello,

I have read the Wiki, skimmed through the source.

Can you provide a generic example on how to tweak the GrepperOperator flag mapping behavior ?

I see line 1200 on-wards,
let flags = s:get_config().operator ......

I suspect it happens here though have no clue (vimscript ignorant) what to set to trigger or config -buffers -noopen and the likes for the GrepperOperator mappings.

Please, add a single line example on how to set up or pass the option flags for GrepperOperator mappings, so that it can be tweaked at will afterwards.

Kindly

Start with the wiki entry for GrepperOperator mappings and inspect the source around line 1200, especially the s:get_config().operator flag handling. Add one generic configuration example showing how to pass or set the mapping flags, then verify that the example explains options such as -buffers and -noopen.

Written by the indexing model from the issue text.