Make another Actions runner page default to Linux

Author: Simran-B

content/actions/hosting-your-own-runners/monitoring-and-troubleshooting-self-hosted-runners.md

@@ -8,6 +8,7 @@ redirect_from:
 versions:
   free-pro-team: '*'
   enterprise-server: '>=2.22'
+defaultPlatform: linux
 ---
 
 {% data reusables.actions.enterprise-beta %}