Enforce proper grammar for set up

doc/.vale/gitlab/Substitutions.yml

doc/administration/reference_architectures/10k_users.md

doc/administration/reference_architectures/25k_users.md

doc/administration/reference_architectures/2k_users.md

doc/administration/reference_architectures/3k_users.md

doc/administration/reference_architectures/50k_users.md

doc/administration/reference_architectures/5k_users.md

doc/administration/sidekiq/index.md

doc/api/google_cloud_integration.md

doc/api/groups.md

doc/api/settings.md

doc/architecture/blueprints/capacity_planning/index.md

.../blueprints/ci_builds_runner_fleet_metrics/ci_insights.md

...architecture/blueprints/gitlab_agent_deployments/index.md

...lueprints/google_artifact_registry_integration/backend.md

doc/architecture/blueprints/remote_development/index.md

..._store_the_secret_detection_gem_in_the_same_repository.md

doc/architecture/blueprints/tailwindcss/index.md

doc/ci/runners/runner_fleet_dashboard.md

doc/development/ai_features/index.md