Sort all variables, outputs, arguments and blocks in resource block.

Adjust code file's style.
Add `numeric = false` for `random_string.name` in `201-mysql-fs-db` module as the name is used as `azurerm_mysql_flexible_server.default`'s `administrator_login` and the login name doesn't support a name start with number.
Add minimum constraints for `random_password.password` in `201-mysql-fs-db` module as the password required a minimum complexity.

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"
   name                = "mysqlfsdb_${random_string.name.result}"
   resource_group_name = azurerm_resource_group.rg.name
   server_name         = azurerm_mysql_flexible_server.default.name
-  charset             = "utf8"
-  collation           = "utf8_unicode_ci"
 }