Actualize snippet example for Next() Method with rest of language versions. (dotnet#9759)

The example doesn't represent a description of it, which has the statement, `generate a specific number of random numbers requested by the user.`. In the current example, the number of random numbers is hard coded to 10 and doesn't read from user input.

Author: chuve

snippets/csharp/System/Random/Overview/next3.cs

@@ -1,30 +1,41 @@
-using System;
+using System;
 
 public class Example
 {
-   public static void Main()
-   {
-      // <Snippet5>
-      Random rnd = new Random();
+    public static void Main()
+    {
+        // <Snippet5>
+        Console.Write("Number of random numbers to generate: ");
 
-      Console.WriteLine("Generating 10 random numbers:");
+        string? line = Console.ReadLine();
+        Random rnd = new Random();
 
-      for (uint ctr = 1; ctr <= 10; ctr++)
-         Console.WriteLine($"{rnd.Next(),15:N0}");
+        if (!int.TryParse(line, out int numbers) || numbers <= 0)
+        {
+            numbers = 10;
+        }
 
-      // The example displays output like the following:
-      //
-      //     Generating 10 random numbers:
-      //         1,733,189,596
-      //           566,518,090
-      //         1,166,108,546
-      //         1,931,426,514
-      //         1,532,939,448
-      //           762,207,767
-      //           815,074,920
-      //         1,521,208,785
-      //         1,950,436,671
-      //         1,266,596,666
-      // </Snippet5>
-   }
+        for (uint ctr = 1; ctr <= numbers; ctr++)
+            Console.WriteLine($"{rnd.Next(),15:N0}");
+
+        // The example displays output like the following when asked to generate
+        // 15 random numbers:
+        // Number of random numbers to generate: 15
+        //     367 920 603
+        //   1 143 790 667
+        //   1 360 963 275
+        //   1 851 697 775
+        //     248 956 796
+        //   1 009 615 458
+        //   1 617 743 155
+        //   1 821 609 652
+        //   1 661 761 949
+        //     477 300 794
+        //     288 418 129
+        //     425 371 492
+        //   1 558 147 880
+        //   1 473 704 017
+        //     777 507 489
+        // </Snippet5>
+    }
 }