[Editorial] SubAccountName: convert normative statements into bullet …

…points (#633)

This PR is in alignment with Issue #606.

specification/columns/subaccountname.md

@@ -2,7 +2,11 @@
 
 A Sub Account Name is a display name assigned to a [*sub account*](#glossary:sub-account). Sub account Name is commonly used for scenarios like grouping based on organizational constructs, access management needs, and cost allocation strategies.
 
-The SubAccountName column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) when the provider supports a *sub account* construct. This column MUST be of type String. If a charge does not apply to a *sub account*, the SubAccountName column MUST be null.
+The SubAccountName column adheres to the following requirements:
+
+* The SubAccountName column MUST be present in a [*FOCUS dataset*](#glossary:FOCUS-dataset) when the provider supports a *sub account* construct.
+* This column MUST be of type String.
+* If a charge does not apply to a *sub account*, the SubAccountName column MUST be null.
 
 See [Appendix: Grouping constructs for resources or services](#groupingconstructsforresourcesorservices) for details and examples of the different grouping constructs supported by FOCUS.