Merge branch '300035-clarify-audit_json-log-tier-entitlements' into 'master'

Clarify documentation for audit_json.log

See merge request gitlab-org/gitlab!52829

doc/administration/logs.md

@@ -381,7 +381,11 @@ only. For example:
 }
 ```
 
-## `audit_json.log` **(PREMIUM)**
+## `audit_json.log` **(FREE)**
+
+NOTE:
+GitLab Free tracks a small number of different audit events.
+[GitLab Premium](https://about.gitlab.com/pricing/) tracks many more.
 
 This file lives in `/var/log/gitlab/gitlab-rails/audit_json.log` for
 Omnibus GitLab packages or in `/home/git/gitlab/log/audit_json.log` for