M47945 Fixing Typo

Translator has reported possible source content issue. 
Description: "PostgreSQ" should be "PostgreSQL"
Affected line: 4

Author: V-vafune

articles/dms/known-issues-azure-postgresql-online.md

@@ -1,7 +1,7 @@
 ---
 title: "Known issues: Online migrations from PostgreSQL to Azure Database for PostgreSQL"
 titleSuffix: Azure Database Migration Service
-description: Learn about known issues and migration limitations with online migrations from PostgreSQL to Azure Database for PostgreSQ using the Azure Database Migration Service.
+description: Learn about known issues and migration limitations with online migrations from PostgreSQL to Azure Database for PostgreSQL using the Azure Database Migration Service.
 services: database-migration
 author: pochiraju
 ms.author: rajpo