Update Create stage pages with 14.0 Admin Area access info

Proposal

Details about this issue are in: #333265 (closed)

Wording to use for accessing Admin Area features in product docs are located in the Style Guide at: https://docs.gitlab.com/ee/development/documentation/styleguide/index.html#how-to-document-the-menus

• /administration/integration/kroki.md
• /administration/integration/terminal.md
• /api/system_hooks.md
• /development/integrations/jenkins.md
• /integration/akismet.md
• /integration/omniauth.md
• /user/admin_area/settings/project_integration_management.md
• /user/project/integrations/mattermost_slash_commands.md
• /user/project/integrations/webex_teams.md
• /administration/static_objects_external_storage.md
• /integration/gitpod.md
• /user/project/web_ide/index.md
• /administration/integration/plantuml.md
• /integration/sourcegraph.md
• /push_rules/push_rules.md
• /user/admin_area/diff_limits.md
• /user/admin_area/merge_requests_approvals.md
• /user/admin_area/settings/account_and_limit_settings.md
• /user/admin_area/settings/index.md
• /user/admin_area/settings/instance_template_repository.md
• /user/admin_area/settings/push_event_activities_limit.md
• /user/admin_area/settings/visibility_and_access_controls.md
• /user/project/repository/branches/default.md

Related to #333265 (closed)