add mandatory language to HTTP request

Author: brettmarquard

docs/specification/1.0.md

@@ -103,7 +103,7 @@ curl "https://example.com/cds-services"
 
 ### HTTP Request
 
-An EHR calls a CDS Service by `POST`ing a JSON document to the service as described in this section. The CDS Service endpoint can be constructed from the CDS Service base URL and an individual service id as `{baseUrl}/cds-services/{service.id}`. The request includes a JSON `POST` body with the following input fields:
+An EHR SHALL call a CDS Service by `POST`ing a JSON document to the service as described in this section. The CDS Service endpoint can be constructed from the CDS Service base URL and an individual service id as `{baseUrl}/cds-services/{service.id}`. The request SHALL include a JSON `POST` body with the following input fields:
 
 Field | Optionality | Type | Description
 ----- | ----- | ----- | --------