Development Guide: Revision n_2202823_development-guide_version_7.0_edition_1.0_release_0-revision_8001643
Chapter 7.4. Clustered HA Singleton Service no longer contains "For more information on node preferences and quorum, see Preferences and Quorum" (which was link to chapter 7.5. HA Singleton Deployments) - see this comment and this comment.
This means that there is no information on node preferences and quorum in chapter 7.4.

Proposed solution:
Please duplicate the content for node preferences and quorum, put it in chapter 7.4 and adjust accordingly (so there is no mention about Singleton deployments).