Update initial_access_github_register_self_hosted_runner.toml

Author: Samirbous

rules/integrations/github/initial_access_github_register_self_hosted_runner.toml

@@ -17,10 +17,10 @@ from = "now-9m"
 index = ["logs-github.audit-*"]
 language = "kuery"
 license = "Elastic License v2"
-name = "First Time Seen GitHub Self Hosted Action Runner"
+name = "New GitHub Self Hosted Action Runner"
 note = """## Triage and analysis
 
-### Investigating First Time Seen GitHub Self Hosted Runner
+### Investigating New GitHub Self Hosted Action Runner
 
 Adversaries who gain the ability to modify or trigger workflows in a linked GitHub repository can execute arbitrary commands on the runner host.