Fixed typo on Discord page (n8n-io#2938)

Author: mwl

docs/integrations/builtin/app-nodes/n8n-nodes-base.discord/index.md

@@ -37,7 +37,7 @@ Refer to [Discord credentials](/integrations/builtin/credentials/discord.md) for
 - Member
 	- Get Many
 	- Role Add
-	- Roll Remove
+	- Role Remove
 
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