Fix format issue of Remove-AzPostgreSqlFlexibleServerDatabase ref doc (#20634)

Author: msJinLei

src/PostgreSql/examples/Remove-AzPostgreSqlFlexibleServerDatabase.md

@@ -6,7 +6,7 @@ Remove a database by name
 
 ### Example 2: Remove a database by Id
 ```powershell
-Remove-AzPostgreSqlFlexibleServerDatabase-InputObject /subscriptions/0000000000-0000-0000-0000-000000000000/resourceGroups/PowershellPostgreSqlTest/providers/Microsoft.DBforPostgreSQL/flexibleServers/postgresql-test/databases/flexibleserverdb
+Remove-AzPostgreSqlFlexibleServerDatabase -InputObject /subscriptions/0000000000-0000-0000-0000-000000000000/resourceGroups/PowershellPostgreSqlTest/providers/Microsoft.DBforPostgreSQL/flexibleServers/postgresql-test/databases/flexibleserverdb
 ```
 Remove a database by Id