fix docs wrong code that causes to all test failed

docs/en/Tutorials/AspNetCore-Mvc/Part-I.md

@@ -50,6 +50,20 @@ namespace Acme.BookStore
         public DateTime PublishDate { get; set; }
 
         public float Price { get; set; }
+
+        protected Book()
+        {
+
+        }
+
+        public Book(Guid id, string name, BookType type, DateTime publishDate, float price)
+        :base(id)
+        {
+            Name = name;
+            Type = type;
+            PublishDate = publishDate;
+            Price = price;
+        }
     }
 }
 ````

docs/en/Tutorials/AspNetCore-Mvc/Part-III.md

@@ -57,25 +57,11 @@ namespace Acme.BookStore
         public async Task SeedAsync(DataSeedContext context)
         {
             await _bookRepository.InsertAsync(
-                new Book
-                {
-                    Id = _guidGenerator.Create(),
-                    Name = "Test book 1",
-                    Type = BookType.Fantastic,
-                    PublishDate = new DateTime(2015, 05, 24),
-                    Price = 21
-                }
+                new Book(_guidGenerator.Create(), "Test book 1", BookType.Fantastic, new DateTime(2015, 05, 24), 21)
             );
 
             await _bookRepository.InsertAsync(
-                new Book
-                {
-                    Id = _guidGenerator.Create(),
-                    Name = "Test book 2",
-                    Type = BookType.Science,
-                    PublishDate = new DateTime(2014, 02, 11),
-                    Price = 15
-                }
+                new Book(_guidGenerator.Create(), "Test book 2", BookType.Science, new DateTime(2014, 02, 11), 15)
             );
         }
     }