Adding metadata descriptions

doc/administration/auth/index.md

 ---
 stage: Govern
 group: Authentication
+description: Third-party authentication providers.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 

doc/administration/configure.md

 ---
 stage: Systems
 group: Distribution
+description: Installation settings.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 

doc/administration/dedicated/index.md

 ---
 stage: SaaS Platforms
 group: GitLab Dedicated
-info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments"
-description: 'Learn how to configure your GitLab Dedicated instance.'
+description: IP allowlists, SAML, maintenance.
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 
 # Configure GitLab Dedicated **(ULTIMATE)**

doc/administration/operations/index.md

 ---
 stage: Systems
 group: Distribution
+description: Backup and restore, move repos, maintenance tasks.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 

doc/administration/settings/index.md

 ---
 stage: none
 group: unassigned
+description: Product settings.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 

doc/security/index.md

 ---
 stage: Govern
 group: Authentication
+description: SSH key limits, 2FA, tokens, hardening.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---
 

doc/user/feature_flags.md

 ---
 stage: none
 group: unassigned
-info: "See the Technical Writers assigned to Development Guidelines: https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments-to-development-guidelines"
-description: "View a list of all the flags available in the GitLab application."
+description: Complete list of flags.
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 layout: 'feature_flags'
 ---
 

doc/user/profile/account/create_accounts.md

 ---
 stage: Govern
 group: Authentication
+description: Passwords, user moderation, broadcast messages.
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
 ---