Merge branch 'doc-remove-overview-manage' into 'master'

Doc: Remove unneeded Overview header from pages

See merge request gitlab-org/gitlab!43799

doc/user/admin_area/credentials_inventory.md

@@ -9,8 +9,6 @@ type: howto
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/20912) in GitLab 12.6.
 
-## Overview
-
 GitLab administrators are responsible for the overall security of their instance. To assist, GitLab provides a Credentials inventory to keep track of all the credentials that can be used to access their self-managed instance.
 
 Using Credentials inventory, you can see all the personal access tokens (PAT) and SSH keys that exist in your GitLab instance. In addition, you can [revoke them](#revoke-a-users-personal-access-token) and see:

doc/user/group/contribution_analytics/index.md

@@ -9,8 +9,6 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 > - Introduced in [GitLab Starter](https://about.gitlab.com/pricing/) 8.3.
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/3090) for subgroups in GitLab 12.2.
 
-## Overview
-
 With Contribution Analytics you can get an overview of the following activity in your
 group: