chore(slack): Update text on dev installation instructions (#14673)

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## DESCRIBE YOUR PR
Slight copy update and accuracy change since slack settings look a
little different.

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## PRE-MERGE CHECKLIST

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Author: leeandher

develop-docs/integrations/slack/index.mdx

@@ -33,7 +33,7 @@ After you update the `config.yml`, `sentry.conf.py`, or `devlocal.py` you need t
 
 Now that you’ve created your app and updated your Sentry config, you can navigate to __Interactivity & Shortcuts__ under __Features__.
 
-Toggle on __Interactivity__.
+Toggle on __Interactivity & Shortcuts__.
 
 Now you’ll be able to enter your **Request URL** (this is the location of your self-hosted Sentry) and **Options Load URL**:
 
@@ -119,7 +119,7 @@ Navigate to __Slash Commands__ under __Features__. Click __Create New Command__
 
 
 <Alert title="Note">
-    When creating the slash command, don’t use `/sentry`. Do something like `/{your_name}-sentry`. If multiple apps are installed with the same slash command, the most recently installed one takes over.
+    If you're a Sentry employee, when creating the slash command avoid using `/sentry`, try something like `/{your_name}-sentry`. If multiple apps are installed with the same slash command, the most recently installed one takes over.
 </Alert>
 
 At the bottom of the page, click __Save__.