Update src/azure-cli/HISTORY.rst

Co-authored-by: Yan Zhu <105691024+yanzhudd@users.noreply.github.com>

Author: a0x1ab

src/azure-cli/HISTORY.rst

@@ -58,7 +58,7 @@ Release History
 
 **PostgreSQL**
 
-* `az postgres flexible-server migrate-network`: Add new command (#32819)
+* `az postgres flexible-server migrate-network`: Add new command to support migrating the network mode of a flexible server (#32819)
 
 **SQL**