Rewrite example of alias named signature

Author: tisonkun

doc/Type/Signature.pod6

@@ -551,8 +551,12 @@ variable name:
 
 Aliases are also possible that way:
 
-    sub ( :color(:colour($c)) ) { }    # 'color' and 'colour' are both OK
-    sub ( :color(:$colour) ) { }       # same API for the caller
+    sub aliase-named(:color(:$colour), :type(:class(:$kind))) { say $colour ~ " " ~ $kind }
+    aliase-named(color => "red", type => "A");     # both name can be use
+    aliase-named(colour => "green", type => "B");  # more than two name is ok
+    aliase-named(color => "white", class => "C");  # every alias is independent
+
+More use of alias can be found in L<sub MAIN|/language/functions#sub_MAIN>
 
 A function with named arguments can be called dynamically, dereferencing a
 L<Pair|/type/Pair> with C<|> to turn it into a named argument.
@@ -784,3 +788,4 @@ Defined as:
 Throws C<X::Cannot::Capture>.
 
 =end pod
+