[Editorial] ServiceName: convert normative statements into bullet poi…

…nts (#631)

This PR is in alignment with Issue #606

specification/columns/servicename.md

@@ -4,7 +4,10 @@ A [*service*](#glossary:service) represents an offering that can be purchased fr
 
 The Service Name is a display name for the offering that was purchased. The Service Name is commonly used for scenarios like analyzing aggregate cost trends over time and filtering data to investigate anomalies.
 
-The ServiceName column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset). This column MUST be of type String and MUST NOT contain null values.
+The ServiceName column adheres to the following requirements:
+
+* The ServiceName column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset).
+* This column MUST be of type String and MUST NOT contain null values.
 
 ## Column ID