Add clarification for the permission needed for GUILD_BAN_ADD and GUILD_BAN_REMOVE. (#7948)

* add the needed permissions to receive guild ban gateway events

* Apply suggestions from code review

Co-authored-by: Mark Mandel <mark@compoundtheory.com>

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Co-authored-by: Colin Loretz <colin.loretz@discordapp.com>
Co-authored-by: Mark Mandel <mark@compoundtheory.com>

Author: 3 people

developers/events/gateway-events.mdx

@@ -713,7 +713,7 @@ Sent when a guild audit log entry is created. The inner payload is an [Audit Log
 
 #### Guild Ban Add
 
-Sent when a user is banned from a guild.
+Sent when a user is banned from a guild. This event is only sent to bots with the `BAN_MEMBERS` or `VIEW_AUDIT_LOG` permission.
 
 <ManualAnchor id="guild-ban-add-guild-ban-add-event-fields" />
 ###### Guild Ban Add Event Fields
@@ -725,7 +725,7 @@ Sent when a user is banned from a guild.
 
 #### Guild Ban Remove
 
-Sent when a user is unbanned from a guild.
+Sent when a user is unbanned from a guild. This event is only sent to bots with the `BAN_MEMBERS` or `VIEW_AUDIT_LOG` permission.
 
 <ManualAnchor id="guild-ban-remove-guild-ban-remove-event-fields" />
 ###### Guild Ban Remove Event Fields