Update handbook links to correct anchor

danger/documentation/Dangerfile

doc/administration/encrypted_configuration.md

doc/administration/package_information/index.md

doc/administration/package_information/licensing.md

doc/administration/package_information/omnibus_packages.md

...administration/package_information/postgresql_versions.md

doc/administration/package_information/signed_packages.md

doc/api/graphql/reference/index.md

doc/api/oauth2.md

.../blueprints/container_registry_metadata_database/index.md

...re/blueprints/gitlab_to_kubernetes_communication/index.md

doc/ci/yaml/gitlab_ci_yaml.md

doc/development/bulk_import.md

doc/development/contributing/design.md

doc/development/export_csv.md

doc/integration/security_partners/index.md

doc/update/package/convert_to_ee.md

doc/update/package/downgrade.md

doc/update/package/index.md

doc/user/admin_area/reporting/spamcheck.md