Updates capability statements for R4

[brendankowitz]

No description provided.

[brandonpollett]

R4 seems to be missing vread.

[jackliums]

Some of the definitions doesn't look right:

                        {
                            "name": "identifier",
                            "definition": "http://hl7.org/fhir/SearchParameter/Account-identifier",
                            "type": "date",
                            "documentation": "Account number"
                        },

Identifier should not be type of date.

[brendankowitz]

@brandonpollett @jackliums anything else seem out of place on this one?

[jackliums]

@brendankowitz I did a quick scan of the file and they all seemed to be fine now.