Step 3: make the UI more consistant between the static menu links and the custom content menu links edit forms. Weight is last now, enable has same label, same weight help text.
Part 3: Minor nit docs fix: third person verb on Helper function extractFormValues.
Step 3: add period to sentence in doc.
Part 3: nit ordered uses.
Part 3: doc on MenuLinkContentDeleteForm constructor change what was assumed to be a copy and paste from ContentEntityForm to say it is the delete form object.
Part 3: just ordering uses again.