Fix markdown spacing in various docs

doc/administration/auditor_users.md

doc/ci/caching/index.md

doc/ci/ci_cd_for_external_repos/bitbucket_integration.md

doc/ci/ci_cd_for_external_repos/github_integration.md

...i/examples/devops_and_game_dev_with_gitlab_ci_cd/index.md

doc/ci/review_apps/index.md

doc/ci/runners/README.md

doc/integration/facebook.md

doc/integration/jira_development_panel.md

doc/tools/email.md

doc/topics/autodevops/quick_start_guide.md

doc/user/admin_area/license.md

doc/user/admin_area/settings/continuous_integration.md

doc/user/discussions/index.md