Update docs/specification/1.0.md

looks good

Co-Authored-By: brettmarquard <[email protected]>

Author: kpshek

docs/specification/1.0.md

@@ -481,7 +481,7 @@ Field | Optionality | Type | Description
 ----- | ----- | ----- | --------
 `type` |  REQUIRED | *string* | The type of action being performed. Allowed values are: `create`, `update`, `delete`.
 `description` | REQUIRED | *string* | Human-readable description of the suggested action MAY be presented to the end-user.
-`resource` | OPTIONAL | *object* | Depending upon the `type` attribute, a new resource or the id of a resource. When the `type` attribute is `create`, the `resource` attribute contains a new FHIR resource to be created. For `delete`, this SHALL be the id of the resource to remove. In hooks where only one "content" resource is ever relevant, this attribute MAY be omitted for deletes only. For `update`, this holds the updated resource.
+`resource` | OPTIONAL | *object* | Depending upon the `type` attribute, a new resource or the id of a resource. When the `type` attribute is `create`, the `resource` attribute SHALL contain a new FHIR resource to be created. For `delete`, this SHALL be the id of the resource to remove. In hooks where only one "content" resource is ever relevant, this attribute MAY be omitted for deletes only. For `update`, this holds the updated resource.
 
 The following example illustrates a create action: