Raise sentence spacing rule to error

doc/.linting/vale/styles/gitlab/SentenceSpacing.yml

doc/README.md

...inistration/auth/how_to_configure_ldap_gitlab_ce/index.md

doc/administration/geo/replication/troubleshooting.md

doc/administration/gitaly/index.md

doc/administration/high_availability/monitoring_node.md

doc/administration/lfs/manage_large_binaries_with_git_lfs.md

...stration/monitoring/performance/influxdb_configuration.md

doc/administration/troubleshooting/sidekiq.md

doc/api/epic_issues.md

doc/api/epics.md

doc/api/group_level_variables.md

doc/api/merge_request_context_commits.md

doc/api/merge_requests.md

doc/api/pipeline_schedules.md

doc/api/services.md

doc/api/settings.md

doc/api/users.md

doc/ci/examples/deployment/composer-npm-deploy.md

doc/ci/services/postgres.md