[Editorial] ResourceType: convert the normative statements into bulle…

…t points (#629)

This PR is in alignment with Issue #606

specification/columns/resourcetype.md

@@ -2,7 +2,11 @@
 
 Resource Type describes the kind of [*resource*](#glossary:resource) the charge applies to. A Resource Type is commonly used for scenarios like identifying cost changes in groups of similar *resources* and may include values like Virtual Machine, Data Warehouse, and Load Balancer.
 
-The ResourceType column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) when the provider supports billing based on provisioned resources and supports assigning a type for resources. This column MUST be of type String and MUST NOT be null when a corresponding [ResourceId](#resourceid) is not null. When a corresponding ResourceId value is null, the ResourceType column value MUST also be null.
+The ResourceType column adheres to the following requirements:
+
+* The ResourceType column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) when the provider supports billing based on provisioned resources and supports assigning a type for resources.
+* This column MUST be of type String and MUST NOT be null when a corresponding [ResourceId](#resourceid) is not null.
+* When a corresponding ResourceId value is null, the ResourceType column value MUST also be null.
 
 ## Column ID