Document Slack workspace installation limit (#2611)

* Update ai/slack-bot.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

* 💅

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Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>
Co-authored-by: Ethan Palm <[email protected]>

Author: mintlify[bot]

ai/slack-bot.mdx

@@ -19,9 +19,11 @@ Each message sent by the bot counts toward your assistant message usage.
 ## Set up the Slack app
 
 <Note>
-  If your Slack Workspace Owner requires admin approval to install apps, ask them to approve the Mintlify Slack app before you add it.
+  You can only install the Slack app once per workspace. If you have multiple Mintlify deployments, you can only connect one deployment at a time to a workspace. You must disconnect the app from one deployment before connecting it to another.
 </Note>
 
+If your Slack Workspace Owner requires admin approval to install apps, ask them to approve the Mintlify Slack app before you add it.
+
 1. Navigate to the [Integrations](https://dashboard.mintlify.com/products/assistant/settings/integrations) tab of the **Assistant Configurations** page in your dashboard.
 1. In the Slack card, click **Connect**. This opens Slack.
   <Frame>