Update 3.18 release notes to include command for raising projects limit (#59949)

Author: isaacmbrown

data/release-notes/enterprise-server/3-18/0.yml

@@ -17,7 +17,19 @@ sections:
           Operators use OpenTelemetry metrics to monitor the appliance. This feature is currently in public preview and should only be used in preproduction environments. You can also export Prometheus metrics to third-party observability systems. See [AUTOTITLE](/admin/monitoring-and-managing-your-instance/monitoring-your-instance/opentelemetry-metrics/about-opentelemetry-metrics).
         # https://github.com/github/releases/issues/6019
         - |
-          Admins can enable a larger item limit on projects, which supports up to 50,000 items. After the upgrade, the `memex-project-items` index will be migrated and an index repair started Once the `memex-project-items` index repair is completed, the new index is automatically promoted to primary and `ENABLE_PROJECTS_INCREASED_LIMITS` can be enabled. If `ENABLE_PROJECTS_INCREASED_LIMITS` is enabled before the index repair is completed, project data will appear to be missing from any partially repaired projects. This problem will resolve itself once the repair completes.
+          Site administrators can enable a larger limit of **50,000 items** on GitHub Projects, rather than the default limit of 1,200.
+
+          1. After upgrading your instance to 3.18, wait for the `memex-project-items` index to be migrated and the `memex-project-items` index repair job to complete.
+
+             If you run the following commands before the index repair is completed, project data will appear to be missing from any partially repaired projects. This problem will resolve itself once the repair completes.
+
+          1. Access the administrative shell and run the following command.
+
+             ``` shell copy
+             ghe-config app.github.projects-increased-limits-enabled true
+             ```
+
+          1. Apply the configuration with `ghe-config-apply`. This will restart services and may cause a brief interruption for users.
 
     - heading: APIs
       notes: