fixup: update telemetry description

Author: jsjoeio

patches/telemetry.diff

@@ -4,6 +4,7 @@ To test:
 1. Create a RequestBin - https://requestbin.io/
 2. Run code-server with `CS_TELEMETRY_URL` set: 
   i.e. `CS_TELEMETRY_URL="https://requestbin.io/1ebub9z1" ./code-server-<version>-macos-amd64/bin/code-server`
+  NOTE: it has to be a production build.
 3. Load code-server in browser an do things (i.e. open a file)
 4. Refresh RequestBin and you should see logs