Clarify onboarding guide for Node.js Web WG

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: bmuenzenmeyer

onboarding/README.md

@@ -1,6 +1,6 @@
 # Onboarding Guide
 
-This folder outlines the steps required to onboard a new member to the @nodejs/web WG and its subteams.
+This folder outlines the steps required to onboard a new member to the Node.js Web Working Group (`@nodejs/web`) and its subteams.
 
 ## General Requirements