Update slack.mdx (#296)

Added `users.profile:read` missing scope

pages/cloud/channels/slack.mdx

@@ -38,7 +38,7 @@ The Slack integration has the following settings:
 ### Bot Token
 
 1. In the left sidebar, click on **Features** > **OAuth & Permissions**
-1. Scroll down to the **Scope** > **Bot Token Scopes** section, click **Add an OAuth Scope**. Select both `chat:write` and `chat:write.customize` options from the list.
+1. Scroll down to the **Scope** > **Bot Token Scopes** section, click **Add an OAuth Scope**. Select `chat:write`, `chat:write.customize` and `users.profile:read` options from the list.
 1. Scroll up and click the **Install to Workspace** button in the **OAuth Tokens for Your Workspace** section
 1. In the next screen, your app will request access to your Slack workspace. Click **Allow**.
 1. In the **OAuth & Permissions > OAuth Tokens for Your Workspace** section, copy the **Bot User OAuth Token**.