Merge branch 'docs-agent-install-ctrt' into 'master'

Docs: CTRT review Agent installation doc

See merge request gitlab-org/gitlab!79147

doc/user/application_security/policies/index.md

@@ -159,7 +159,7 @@ at the bottom of the editor.
 
 You can use policy alerts to track your policy's impact. Alerts are only available if you've
 [installed](../../clusters/agent/repository.md)
-and [configured](../../clusters/agent/install/index.md#register-an-agent-with-gitlab)
+and [configured](../../clusters/agent/install/index.md#register-the-agent-with-gitlab)
 an agent for this project.
 
 There are two ways to create policy alerts:

doc/user/clusters/agent/ci_cd_tunnel.md

@@ -20,7 +20,7 @@ Only CI/CD jobs set in the configuration project can access one of the configure
 ## Prerequisites
 
 - An existing Kubernetes cluster.
-- An agent [installed on your cluster](install/index.md#install-the-agent-into-the-cluster).
+- An Agent [installed on your cluster](install/index.md).
 
 ## Use the CI/CD Tunnel to run Kubernetes commands from GitLab CI/CD