Update reaction role page with example of how to show pairings

[khord]

I could not find examples in the documentation of how to automatically populate the reaction role message with the emoji-role pairings. Took a lot of searching to find someone explaining that it is done with {roles}

command:

!rr edit <msg_id> Reaction Roles | Click on the emoji of the game/topic you wish to be
added to for notifications/channel access. 
{roles}

result: