added snapshot isolation to toc

Author: julieMSFT

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

@@ -211,6 +211,8 @@
     items:
     - name: Dynamic SQL
       href: sql-data-warehouse-develop-dynamic-sql.md
+    - name: Read committed snapshot isolation 
+      href: /sql/t-sql/statements/alter-database-transact-sql-set-options?view=azure-sqldw-latest
     - name: Group by options
       href: sql-data-warehouse-develop-group-by-options.md
     - name: Labels