Fix Operator xrefs

Fix all of the broken xrefs in the Operator docs that are flagged up in the Antora build.

repo: https://github.com/couchbase/couchbase-operator | branch: 1.0.x | component: operator | version: 1.0
path: docs/user/modules/ROOT/pages/cluster-status-guide.adoc | xref: admin-console-access.adoc

repo: https://github.com/couchbase/couchbase-operator | branch: 1.1.x | component: operator | version: 1.1
path: docs/user/modules/ROOT/pages/cluster-status-guide.adoc | xref: admin-console-access.adoc

repo: https://github.com/couchbase/couchbase-operator | branch: 1.2.x | component: operator | version: 1.2
path: docs/user/modules/ROOT/pages/cluster-status-guide.adoc | xref: admin-console-access.adoc
path: docs/user/modules/ROOT/pages/helm-cluster-config.adoc | xref: install-openshift.html

repo: https://github.com/couchbase/couchbase-operator | branch: 2.0.x | component: operator | version: 2.0
path: docs/user/modules/ROOT/pages/howto-client-sdks.adoc | xref: server::sdk/overview.adoc
path: docs/user/modules/ROOT/pages/howto-ui.adoc | xref: couchbase-cluster-comfig.adoc
path: docs/user/modules/ROOT/pages/tutorial-sync-gateway-clients.adoc | xref: rest-api.adoc
path: docs/user/modules/ROOT/pages/tutorial-sync-gateway-manage.adoc | xref: sync-gateway::admin-test-api.adoc