nit - said chat instead of assistant

Author: baell

ai/slack-app.mdx

@@ -10,7 +10,7 @@ icon: "slack"
 
 The Slack app adds a bot named `@mintlify` to your Slack workspace that can search your documentation and answer users' questions. The bot responds to direct messages, @mentions, and to any questions in a channel specifically named `#ask-ai`.
 
-The Slack app can incur costs: either using your AI chat credits or incurring overages.
+The Slack app can incur costs: either using your AI assistant credits or incurring overages.
 
 ## Setting up the Slack app