example with-sentry note that server side logging available too (#5261)

Trivial note to remind anyone doing sentry that they should consider doing server side logging too.

examples/with-sentry/README.md

@@ -45,4 +45,5 @@ now
 
 This example show you how to add Sentry to catch errors in next.js
 
-You will need a Sentry DSN for your project. You can get it from the Settings of your Project, in **Client Keys (DSN)**, and copy the string labeled **DSN (Public)**.
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+You will need a Sentry DSN for your project. You can get it from the Settings of your Project, in **Client Keys (DSN)**, and copy the string labeled **DSN (Public)**.
+Note that if you are using a custom server, there is logging available for common platforms: https://docs.sentry.io/platforms/javascript/express/?platform=node