Merge branch 'francoisrose/clarify-service-desk-metrics-2023-06-20' into 'master'

Clarify description of Service Desk metrics

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124155



Merged-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Sebastian Rehm <srehm@gitlab.com>
Co-authored-by: François Rosé <frose@gitlab.com>

config/metrics/counts_28d/20210216181147_service_desk_enabled_projects.yml

 ---
 data_category: optional
 key_path: usage_activity_by_stage_monthly.plan.service_desk_enabled_projects
-description: Count creator ids from projects with service desk enabled
+description: Count unique users who created projects (creator_id) with service desk enabled
 product_section: ops
 product_stage: monitor
 product_group: respond

config/metrics/counts_all/20210216181122_service_desk_enabled_projects.yml

 ---
 data_category: optional
 key_path: usage_activity_by_stage.plan.service_desk_enabled_projects
-description: Count creator ids from projects with service desk enabled
+description: Count unique users who created projects (creator_id) with service desk enabled
 product_section: ops
 product_stage: monitor
 product_group: respond