It's not clear if the documentation explains how to convert from Community to Enterprise. (It's sort of implicit if you understand MongoDB well enough to use one of the various Enterprise Installation instructions and maybe one of the 3 sets of Upgrade instructions in the Release Notes, but that's a tall order that presupposes that the user is aware of those 4 separate pages in the documentation.

I propose that the Installation docs for Enterprise have subsections identifying how to convert from Community, that each Installation document links to each of the 3 Upgrading documents in the Release Notes, and that each of the Upgrading documents in the Release Notes call out the fact that the upgrade steps also (roughly) define the order of doing rolling cutovers from Community to Enterprise.

(I see no need to document how to switch from Enterprise to Community, in case that matters.)