Update linux_function_app.html.markdown (hashicorp#27745)

website/docs/r/linux_function_app.html.markdown

@@ -35,7 +35,7 @@ resource "azurerm_service_plan" "example" {
   resource_group_name = azurerm_resource_group.example.name
   location            = azurerm_resource_group.example.location
   os_type             = "Linux"
-  sku_name            = "Y1"
+  sku_name            = "B1"
 }
 
 resource "azurerm_linux_function_app" "example" {