update spectator-js performance numbers

Author: copperlight

docs/spectator/lang/nodejs/usage.md

@@ -454,11 +454,13 @@ describe("Protocol Parser Tests", (): void => {
 On an `m5d.2xlarge` EC2 instance, with `Node.js v22.16.0` and `nflx-spectator: ^3.0.5`, we have
 observed the following single-threaded performance numbers across a two-minute test window:
 
-* ??? requests/second over `udp`
+* 85,317 requests/second over `udp` with `await`
 
 The benchmark incremented a single counter with two tags in a tight loop, to simulate real-world tag
 usage, and the rate-per-second observed on the corresponding Atlas graph matched. The protocol line
 was `74` characters in length.
 
-The Node.js process CPU usage was ~100% and the `spectatord` process CPU usage was ~55% on this 8
+The Node.js process CPU usage was ~100% and the `spectatord` process CPU usage was ~50% on this 8
 vCPU system.
+
+Without `await`, a heap limit allocation fail error will occur around 5.5M iterations at 34 seconds.