Many pages in the Developer Guide are change-controlled. These pages should have a clear admonition element (such as a note directive) that states
#. The page is change controlled
#. The person/organization responsible for approving changes (or another process like RFC).
This will provide great transparency over what parts of the developer guide are informational versus requirements. This will also make it easier for a DM team member to understand who to set as a potential reviewer for any changes.