Fix quickstart (#22)

quickstart.mdx

@@ -23,7 +23,7 @@ There are three ways to receive questions in Plain – email, contact forms or S
 
 **Contact forms (Optional)** – Forms are a great way to offer support at scale. Use [these instructions](/contact-forms/) to set up a form or a floating widget.
 
-**Slack (Optional)** – We are currently giving early access to select customers, if you are interested in providing support via Slack using Plain, reach out to us and we give you beta access. [Find out more here](/slack).
+**Slack** - Our Slack integration lets you sync messages from selected Slack channels to Plain and respond directly to customers from the platform. [Find out more here](/slack).
 
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