fix: Remove Line Numbers (#810)

Fixes #621

Author: BenjaminMichaelis

src/Chapter04/Listing04.22.NestedIf.cs

@@ -19,27 +19,27 @@ public static void Main()
         input = int.Parse(Console.ReadLine());
 
         // Condition 1.
-        if (input <= 0) // line 16
+        if (input <= 0)
             // Input is less than or equal to 0
             Console.WriteLine("Exiting...");
         else
             // Condition 2.
-            if (input < 9) // line 20
+            if (input < 9)
                 // Input is less than 9
                 Console.WriteLine(
                     $"Tic-tac-toe has more than {input}" +
                     " maximum turns.");
             else
                 // Condition 3.
-                if (input > 9) // line 26
+                if (input > 9)
                     // Input is greater than 9
                     Console.WriteLine(
                         $"Tic-tac-toe has fewer than {input}" +
                         " maximum turns.");
                 // Condition 4.
                 else
                     // Input equals 9
-                    Console.WriteLine(  // line 33
+                    Console.WriteLine(
                         "Correct, tic-tac-toe " +
                         "has a maximum of 9 turns.");
         #endregion INCLUDE