Adds better example for Any.roll

Eliminates the class example, and adds pointers. Refs #1731

Author: JJ

doc/Type/Any.pod6

@@ -605,8 +605,12 @@ Coerces the invocant to a C<list> by applying its
 L«C<.list>|/routine/list» method and uses
 L«C<List.roll>|/type/List#routine_roll» on it.
 
-    say Any.roll;    # OUTPUT: «(Any)␤»
-    say Any.roll(5); # OUTPUT: «((Any) (Any) (Any) (Any) (Any))␤»
+    my Mix $m = ("þ" xx 3, "ð" xx 4, "ß" xx 5).Mix
+    say $m.roll; # OUTPUT: «ð␤»
+    say $m.roll; # OUTPUT: «(ß ß þ ß þ)␤»
+
+C<$m>, in this case, is converted into a list and then a (weighted in
+this case) dice is rolled on it. See also L<C<List.roll>|/type/List#routine_roll> for more information.
 
 =head2 method pick