Merge branch 'fix/doc-integration-security-partners-container-security' into 'master'

Add tier to security partners integrations doc

See merge request gitlab-org/gitlab!70648

doc/integration/security_partners/index.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 type: index
 ---
 
-# Security partner integrations
+# Security partner integrations **(FREE)**
 
 You can integrate GitLab with its security partners. This page has information on how do this with
 each security partner: