add missing ? to model types and combine left out data annotations into one line (#34579)

Author: salpelter

aspnetcore/tutorials/first-mvc-app/start-mvc/sample/MvcMovie90/Models/Movie.cs

@@ -117,16 +117,15 @@ public class Movie
 {
     public int Id { get; set; }
     [StringLength(60, MinimumLength = 3)]
-    public string Title { get; set; }
+    public string? Title { get; set; }
     [Display(Name = "Release Date"), DataType(DataType.Date)]
     public DateTime ReleaseDate { get; set; }
     [RegularExpression(@"^[A-Z]+[a-zA-Z\s]*$"), Required, StringLength(30)]
-    public string Genre { get; set; }
-    [Range(1, 100), DataType(DataType.Currency)]
-    [Column(TypeName = "decimal(18, 2)")]
+    public string? Genre { get; set; }
+    [Range(1, 100), DataType(DataType.Currency), Column(TypeName = "decimal(18, 2)")]
     public decimal Price { get; set; }
     [RegularExpression(@"^[A-Z]+[a-zA-Z0-9""'\s-]*$"), StringLength(5)]
-    public string Rating { get; set; }
+    public string? Rating { get; set; }
 }
 // </snippet_AttrOneLine>
 #endif