added workload management portal quickstarts

Author: ronortloff

articles/synapse-analytics/sql-data-warehouse/toc.yml

@@ -49,10 +49,14 @@
     items: 
     - name: Create workload classifier
       items:
+      - name: Portal
+        href: quickstart-create-a-workload-classifier-portal.md 
       - name: T-SQL
         href: quickstart-create-a-workload-classifier-tsql.md 
     - name: Create workload isolation
       items:
+      - name: Portal
+        href: quickstart-configure-workload-isolation-portal.md
       - name: T-SQL
         href: quickstart-configure-workload-isolation-tsql.md
   - name: Pause and resume