Docs: Fix broken anchors in development docs

doc/articles/index.md

doc/development/changelog.md

doc/development/contributing/merge_request_workflow.md

doc/development/documentation/index.md

...development/documentation/site_architecture/global_nav.md

doc/development/documentation/styleguide.md

doc/development/ee_features.md

doc/development/fe_guide/architecture.md

doc/development/fe_guide/vue.md

doc/development/testing_guide/best_practices.md

doc/development/testing_guide/testing_levels.md