intermediate element naming should be improved

**Details**
_intermediate_ elements are named in the following pattern: [PARENT]-1-of-[a]. In using the map I have found that this is not very intuitive as the intermediate element then provides no insight into what the nature of the connected elements are. See Image 1 for the current example- did-spec-registries-1of-a is the intermediate element. A more informative name might be:
_did-spec-registries->signatures-1-of-n_ or simply _signatures-1-of-n_ (the issue with the latter schema is that it could easily hit duplicate element names in the map where as the former of the two proposed new schemes is just a long name)

**Proposed outcome**
- Consider a different naming scheme for intermediate elements and apply that naming scheme to the appropriate elements
- Update the wiki with the new naming scheme

**Image 1**