Fixed a typo

Thanks for this repo :)

Author: fermentfan

src/main/java/guru/springframework/controllers/ProductController.java

@@ -22,7 +22,7 @@ public void setProductService(ProductService productService) {
     @RequestMapping(value = "/products", method = RequestMethod.GET)
     public String list(Model model){
         model.addAttribute("products", productService.listAllProducts());
-        System.out.println("Returning rpoducts:");
+        System.out.println("Returning products:");
         return "products";
     }