fix mysql type

Author: agehrig

content/en/docs/06_azure/5-mariadb.md renamed to content/en/docs/06_azure/5-mysql.md

@@ -84,7 +84,7 @@ resource "azurerm_mysql_flexible_server" "demo" {
   location                     = azurerm_resource_group.db.location
   administrator_login          = "demo"
   administrator_password       = random_password.mysql.result
-  sku_name                     = "B_Standard_B1s"
+  sku_name                     = "B_Standard_B1ms"
   backup_retention_days        = 7
   geo_redundant_backup_enabled = false
   version                      = "8.0.21"