201-mysql-fs-db patch (#182)

* fix example

* fix example

* fix example

quickstart/201-mysql-fs-db/mysql-fs-db.tf

@@ -1,8 +1,8 @@
 # Manages the MySQL Flexible Server Database
-resource "azurerm_mysql_flexible_database" "default" {
-  charset             = "utf8"
-  collation           = "utf8_unicode_ci"
+resource "azurerm_mysql_flexible_database" "main" {
+  charset             = "utf8mb4"
+  collation           = "utf8mb4_unicode_ci"
   name                = "mysqlfsdb_${random_string.name.result}"
   resource_group_name = azurerm_resource_group.rg.name
   server_name         = azurerm_mysql_flexible_server.default.name
-}
+}