[EDITORIAL] ChargeCategory: convert normative statement into bullet p…

…oints (#651)

This PR is related to issue #606 and converts normative statements into
bullet points.

specification/columns/chargecategory.md

@@ -2,7 +2,10 @@
 
 Charge Category represents the highest-level classification of a charge based on the nature of how it is billed. Charge Category is commonly used to identify and distinguish between types of charges that may require different handling.
 
-The ChargeCategory column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) and MUST NOT be null. This column is of type String and MUST be one of the allowed values.
+The ChargeCategory column adheres to the following requirements:
+
+* The ChargeCategory column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) and MUST NOT be null.
+* This column is of type String and MUST be one of the allowed values.
 
 ## Column ID