Update understand-cost-mgt-data.md to reflect minimum roles needed to modify tags

The document currently states that access as a contributor at resource level is needed to modify tags. This is incorrect and most organizations will be reluctant to grant such access to FinOps teams. Tag contributor role is more appropriate.

Author: jithinsarath

articles/cost-management-billing/costs/understand-cost-mgt-data.md

@@ -114,7 +114,7 @@ Cost Management receives tags as part of each usage record submitted by the indi
 - Resource tags are only included in usage data while the tag is applied – tags aren't applied to historical data.
 - Resource tags are only available in Cost Management after the data is refreshed.
 - Resource tags are only available in Cost Management when the resource is active/running and producing usage records. For example, when a VM is deallocated.
-- Managing tags requires contributor access to each resource.
+- Managing tags requires contributor access to each resource or the [tag contributor](https://learn.microsoft.com/en-us/azure/role-based-access-control/built-in-roles#tag-contributor) RBAC role.
 - Managing tag policies requires either owner or policy contributor access to a management group, subscription, or resource group.
 
 If you don't see a specific tag in Cost Management, consider the following questions: