Update docfx.json

Fixing cost-management-billing search scope.

Author: JasonWHowell

docfx.json

@@ -619,10 +619,8 @@
         "articles/azure-cache-for-redis/**/*.yml": ["Azure","Cache for Redis"],
         "articles/azure-databricks/**/*.md": ["Azure","Azure Databricks"],
         "articles/azure-databricks/**/*.yml": ["Azure","Azure Databricks"],
-        "articles/billing/**/*.md": ["Azure","Cost Management","Billing"],
-        "articles/billing/**/*.yml": ["Azure","Cost Management","Billing"],
-        "articles/cost-management/**/*.md": ["Azure","Billing","Cost Management"],
-        "articles/cost-management/**/*.yml": ["Azure","Billing","Cost Management"],
+        "articles/cost-management-billing/**/*.md": ["Azure","Cost Management Billing"],
+        "articles/cost-management-billing/**/*.yml": ["Azure","Cost Management Billing"],
         "articles/cosmos-db/**/*.md": ["Azure","Azure Cosmos DB"],
         "articles/cosmos-db/**/*.yml": ["Azure","Azure Cosmos DB"],
         "articles/data-catalog/**/*.md": ["Azure","Azure Data Catalog"],