Update Possessive.yml to error status

doc/.vale/gitlab/Possessive.yml

doc/README.md

...rchitecture/blueprints/cloud_native_gitlab_pages/index.md

doc/development/README.md

doc/development/api_graphql_styleguide.md

doc/development/architecture.md

doc/development/contributing/index.md

doc/development/dangerbot.md

doc/development/diffs.md

doc/development/fe_guide/dependencies.md

doc/development/fe_guide/development_process.md

doc/development/fe_guide/frontend_faq.md

doc/development/fe_guide/index.md

doc/development/graphql_guide/index.md

doc/development/import_project.md

doc/development/new_fe_guide/index.md

doc/development/performance.md

doc/development/pipelines.md

doc/development/repository_mirroring.md

doc/development/testing_guide/end_to_end/page_objects.md