docs: add comment about emitting error events

Author: jsjoeio

test/unit/node/app.test.ts

@@ -64,8 +64,9 @@ describe("createApp", () => {
     const server = app[2]
 
     const testError = new Error("Test error")
-    // Emitting error events on servers
-    // https://stackoverflow.com/a/33872506/3015595
+    // We can easily test how the server handles errors
+    // By emitting an error event
+    // Ref: https://stackoverflow.com/a/33872506/3015595
     server.emit("error", testError)
     expect(spy).toHaveBeenCalledTimes(1)
     expect(spy).toHaveBeenCalledWith(`http server error: ${testError.message} ${testError.stack}`)