fix: fix typo in link to Slack trigger on credentials page (n8n-io#2449)

Author: MarcL

docs/integrations/builtin/credentials/slack.md

@@ -11,7 +11,7 @@ priority: high
 You can use these credentials to authenticate the following nodes:
 
 - [Slack](/integrations/builtin/app-nodes/n8n-nodes-base.slack/)
-- [Slack Trigger](/integrations/builtin/trigger-ndoes/n8n-nodes-base.slacktrigger/)
+- [Slack Trigger](/integrations/builtin/trigger-nodes/n8n-nodes-base.slacktrigger/)
 
 ## Supported authentication methods