[Roll] Review of draft-ietf-roll-enrollment-priority-10

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Ines requested that I do a review of draft-ietf-roll-enrollment-priority-10.
I found it pretty clear and easy to read so only have some editorial feedback.

You can find my editorial feedback in the PDF marked up at
https://1drv.ms/b/s!Aqj-Bj9PNivcn-gVUIqhJ87NECDL8w?e=I29CeP

Summary of main points (see PDF for context and more details):
* Clarify wording around definition of enrollment vs onboarding
* The DODAG size is specified as a multiple of a power of 2.  If the actual size always
such a multiple, or do you round up or round down?
* The doc says “the DODAG size may slightly change between a DIO and the 
next, so the value transmitted MUST be considered as an approximation”
but it’s not clear what it means to “consider it as an approximation”.  So
how can you tell whether this MUST is met or not?   Either don’t use MUST or
give a more concrete explanation as to what that means.

Summary of some of the editorial nits:
* Expand acronyms on first use that the RFC editor’s abbreviation list doesn’t have an asterisk by.
* Use consistent casing of some terms that are presently inconsistent.
* Some English grammar suggestions (“like” vs “such as”, “that” vs “which” usage).
* Duplicate “the the”.
* Content-free Appendix A can be removed.

Dave