Clarify not supported Next.js features (#4266)

iker-barriocanal · web-flow · commit 5fe07de241f3 · 2021-10-15T10:11:21.000+02:00
diff --git a/src/includes/getting-started-primer/javascript.nextjs.mdx b/src/includes/getting-started-primer/javascript.nextjs.mdx
@@ -15,3 +15,4 @@ Features:
 - Automatic [Performance Monitoring](/product/performance/) for both the client and server, from version `6.5.0`
 
 Under the hood the SDK relies on our [React SDK](/platforms/javascript/guides/react/) on the frontend and [Node SDK](/platforms/node) on the backend, which makes all features available in those SDKs also available in this SDK.
+However, using a [custom server](https://nextjs.org/docs/advanced-features/custom-server) is not currently supported.

Original file line number	Diff line number	Diff line change
`@@ -15,3 +15,4 @@ Features:`
`15`	`15`	- Automatic [Performance Monitoring](/product/performance/) for both the client and server, from version `6.5.0`
`16`	`16`
`17`	`17`	`Under the hood the SDK relies on our [React SDK](/platforms/javascript/guides/react/) on the frontend and [Node SDK](/platforms/node) on the backend, which makes all features available in those SDKs also available in this SDK.`
	`18`	`+However, using a [custom server](https://nextjs.org/docs/advanced-features/custom-server) is not currently supported.`