Update src/Chapter04/Listing04.22.NestedIf.cs
MODIFY
src/Chapter04/Listing04.22.NestedIf.cs
src/Chapter04/Listing04.22.NestedIf.cs
-// Justification: Checkihng for null isn't discussed yet.
+// Justification: Checking for null isn't discussed yet.
#pragma warning disable CS8604 // Possible null reference argument
namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_22
{

Update src/Chapter04/Listing04.22.NestedIf.cs

Co-authored-by: Kevin B <Keboo@users.noreply.github.com>