Clarify user documentation (fixes #220) (#421)

Author: kpshek

docs/specification/1.0.md

@@ -111,7 +111,7 @@ Field | Optionality | Type | Description
 <nobr>`hookInstance`</nobr> | REQUIRED | *string* | A UUID for this particular hook call (see more information below).
 `fhirServer` | OPTIONAL | *URL* | The base URL EHR's [FHIR](https://www.hl7.org/fhir/) server. If fhirAuthorization is provided, this field is REQUIRED.  The scheme should be `https`
 `fhirAuthorization` | OPTIONAL | *object* | A structure holding an [OAuth 2.0][OAuth 2.0] bearer access token granting the CDS Service access to FHIR resources, along with supplemental information relating to the token. See the [FHIR Resource Access](#fhir-resource-access) section for more information.
-`user` | REQUIRED | *string* | The FHIR resource type + id representing the current user.<br />The type is one of: [Practitioner](https://www.hl7.org/fhir/practitioner.html), [Patient](https://www.hl7.org/fhir/patient.html), or [RelatedPerson](https://www.hl7.org/fhir/relatedperson.html).<br />For example, `Practitioner/123`
+`user` | REQUIRED | *string* | The id of the current user.<br />For example, if the user represents a FHIR resource on the given FHIR server, the resource type would be one of [Practitioner](https://www.hl7.org/fhir/practitioner.html), [Patient](https://www.hl7.org/fhir/patient.html), or [RelatedPerson](https://www.hl7.org/fhir/relatedperson.html).<br />If the user was a Practitioner, this value would be `Practitioner/123`
 `context` | REQUIRED | *object* | Hook-specific contextual data that the CDS service will need.<br />For example, with the `patient-view` hook this will include the FHIR identifier of the [Patient](https://www.hl7.org/fhir/patient.html) being viewed.  For details, see the Hooks specification page.
 `prefetch` | OPTIONAL | *object* | The FHIR data that was prefetched by the EHR (see more information below).