[The Generic DID Scheme] ABNF definitions for did-path and did-fragment are missing from the draft specification

[mwherman2000]

In https://w3c-ccg.github.io/did-spec/#the-generic-did-scheme, it states...

Following is the ABNF definition using the syntax in [RFC5234] (which defines ALPHA as upper or lowercase A-Z).
did-reference = did [ "/" did-path ] [ "#" did-fragment ]
did = "did:" method ":" specific-idstring
method = 1*methodchar
methodchar = %x61-7A / DIGIT
specific-idstring = idstring ( ":" idstring )
idstring = 1idchar
idchar = ALPHA / DIGIT / "." / "-"
See Sections 3.3 Paths and 3.4 Fragments for the ABNF rules defining DID paths and fragments.

1. No did-path rule is defined in this section
2. No did-fragment rule is defined in this section
3. No did-path rule is defined anywhere in the draft specification (e.g. https://w3c-ccg.github.io/did-spec/#paths does not contain an ABNF rule for did-path)
4. No did-fragment rule is defined anywhere in the draft specification (e.g. https://w3c-ccg.github.io/did-spec/#fragments does not contain an ABNF rule for did-fragment)

[dmitrizagidulin]

Addressed in PR #168 -- the ABNF rules for query, path and fragment components are defined in the URI RFC; they are intentionally not re-specified here.