Recording dates in the documentation

Also a small fix for the name

doc/development/telemetry/usage_ping.md

@@ -396,6 +396,8 @@ appear to be associated to any of the services running, since they all appear to
 | `installation_type`                                       |                                      |               |                  |         |                                                                            |
 | `active_user_count`                                       |                                      |               |                  |         |                                                                            |
 | `recorded_at`                                             |                                      |               |                  |         |                                                                            |
+| `recording_ce_finished_at`                                |                                      |               |                  | CE+EE   | When the core features were computed                                       |
+| `recording_ee_finished_at`                                |                                      |               |                  | EE      | When the EE-specific features were computed                                |
 | `edition`                                                 |                                      |               |                  |         |                                                                            |
 | `license_md5`                                             |                                      |               |                  |         |                                                                            |
 | `license_id`                                              |                                      |               |                  |         |                                                                            |
@@ -699,7 +701,7 @@ appear to be associated to any of the services running, since they all appear to
 | `projects_mirrored_with_pipelines_enabled`                | `usage_activity_by_stage`            | `release`     |                  | EE      | Projects with repository mirroring enabled                                 |
 | `releases`                                                | `usage_activity_by_stage`            | `release`     |                  | CE+EE   | Unique release tags in project                                             |
 | `successful_deployments`                                  | `usage_activity_by_stage`            | `release`     |                  | CE+EE   | Total successful deployments                                               |
-| `user_preferences_group_overview_security_dashboard: 0`   | `usage_activity_by_stage`            | `secure`      |                  |         |                                                                            |
+| `user_preferences_group_overview_security_dashboard`      | `usage_activity_by_stage`            | `secure`      |                  |         |                                                                            |
 | `ci_builds`                                               | `usage_activity_by_stage`            | `verify`      |                  | CE+EE   | Unique builds in project                                                   |
 | `ci_external_pipelines`                                   | `usage_activity_by_stage`            | `verify`      |                  | CE+EE   | Total pipelines in external repositories                                   |
 | `ci_internal_pipelines`                                   | `usage_activity_by_stage`            | `verify`      |                  | CE+EE   | Total pipelines in GitLab repositories                                     |