docs: new Slack channel to request new APIs (#3477)

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docs-v2/guides/new-api-support.mdx

@@ -14,7 +14,7 @@ Nango support all authorization types (OAuth, API key, basic), including custom
 
 # Option 1: Ask Nango to add support for a new API
 
-The simplest way to add a new API is to ask us in the [community](https://nango.dev/slack) on the `#contribution` channel. 
+The simplest way to add a new API is to ask us in the [community](https://nango.dev/slack) on the `#request-a-new-api` channel. 
 
 We usually deliver them in <48h, for free.