Docs: Fix error in provisioning docs for discord notifier (#38579)
Docs: Fix error in provisioning docs for discord notifier (#38579)

Fixes an error in provisioning docs for discord notifier referencing the wrong 
name of the "message content" setting.

Fixes #38494
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana