Update concepts-lake-database.md

In the format, it does not include delta. We can create delta table as well in Lake Database as primarily it is stored in parquet only.

Author: bhadreshshiyal

articles/synapse-analytics/database-designer/concepts-lake-database.md

@@ -24,7 +24,7 @@ The new database designer gives you the possibility to create a data model for y
 
 ## Data storage 
 
-Lake databases use a data lake on the Azure Storage account to store the data of the database. The data can be stored in Parquet or CSV format and different settings can be used to optimize the storage. Every lake database uses a linked service to define the location of the root data folder. For every entity, separate folders are created by default within this database folder on the data lake. By default all tables within a lake database use the same format but the formats and location of the data can be changed per entity if that is requested. 
+Lake databases use a data lake on the Azure Storage account to store the data of the database. The data can be stored in Parquet, Delta or CSV format and different settings can be used to optimize the storage. Every lake database uses a linked service to define the location of the root data folder. For every entity, separate folders are created by default within this database folder on the data lake. By default all tables within a lake database use the same format but the formats and location of the data can be changed per entity if that is requested. 
 
 
 ## Database compute