Clarify projects list content in usage quotas page

doc/ci/pipelines/cicd_minutes.md

@@ -90,6 +90,10 @@ To view CI/CD minutes being used for your group:
 ![Group CI/CD minutes quota](img/group_cicd_minutes_quota.png)
+The projects list shows projects with CI/CD minute usage or shared runners usage
+in the current month only. The list includes all projects in the namespace and its
+subgroups, sorted in descending order of CI/CD minute usage.
+
 ## View CI/CD minutes used by a personal namespace
 > Displaying shared runners duration [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/345795) in GitLab 15.0.
@@ -100,6 +104,10 @@ You can view the number of CI/CD minutes being used by a personal namespace:
 1. Select **Edit profile**.
 1. On the left sidebar, select **Usage Quotas**.
+The projects list shows [personal projects](../../user/project/working_with_projects.md#view-personal-projects)
+with CI/CD minutes usage or shared runners usage in the current month only. The list
+is sorted in descending order of CI/CD minute usage.
+
 ## Purchase additional CI/CD minutes **(FREE SAAS)**
 If you're using GitLab SaaS, you can purchase additional packs of CI/CD minutes.