Improving Discord Bot Setup to actually work

[Xelfi]

Hi there,

I'm just letting you know that this wiki page might be updated (cause it's actually outdated due to new discord bot features):
https://github.com/42wim/matterbridge/wiki/Discord-bot-setup

In fact the section "Privileged Gateway Intents" has a missing point:
We also have to toggle "Message Content Intent" (which can be pretty obvious) in addition to the "Server Members Intent".
See: http://prntscr.com/NftbbSLjX9it

If the Message Content Intent is not enabled, the bridge can no longer get any messages to transfer.

[qaisjp]

Issue also created at #1917.

I've resolved the issue, no need for this discussion anymore. Feel free to re-open or follow up on the issue if you have anything to add.