Fix example to not confuse the topic at hand with []'s internal itemization

Author: skids

lib/Type/Signature.pod

@@ -183,9 +183,9 @@ dissolving one or more layers of bare C<Iterables>.  Slurpy parameters declared
 with two stars do not do so:
 
     sub a (*@a) { @a.join("|").say };
-    a(1,[1,2],[[3,4],5]); # 1|1|2|3 4|5
+    a(1,[1,2],([3,4],5)); # 1|1|2|3|4|5
     sub b (**@b) { @b.join("|").say };
-    b(1,[1,2],[[3,4],5]); # 1|1 2|3 4 5
+    b(1,[1,2],([3,4],5)); # 1|1 2|3 4 5
 
 Normally a slurpy parameter will create an Array, create a new
 Scalar container for each argument, and assign the value from each