Minor clarification to the 'Calling a CDS Service' section (fixes #304)

Author: kpshek

docs/specification/1.0.md

@@ -99,10 +99,7 @@ curl "https://example.com/cds-services"
 
 ### HTTP Request
 
-An EHR calls a CDS service by `POST`ing a JSON document to the service
-endpoint, which can be constructed from the CDS Service base URL and an
-individual service id as `{baseUrl}/cds-services/{service.id}`.  The CDS Hook
-call includes a JSON POST body with the following input fields:
+An EHR calls a CDS service by `POST`ing a JSON document as described in this section to the service endpoint, which can be constructed from the CDS Service base URL and an individual service id as `{baseUrl}/cds-services/{service.id}`. The CDS Hook call includes a JSON POST body with the following input fields:
 
 Field | Optionality | Type | Description
 ----- | ----- | ----- | --------