sigil-() is no longer magical since 6.d

Includes an example, definitely closes #2113

Author: JJ

doc/Type/Hash.pod6

@@ -51,6 +51,11 @@ Elements in this hash can be paired both sides of the Pair C<:b(3)>.
 
     say %(«a b c 1 2 3»).^name;           # OUTPUT: «Hash␤»
 
+An empty hash can be initialized either with empty braces or, since 6.d, C<%()>.
+
+    say %().^name; # OUTPUT: «Hash␤»
+    say {}.^name;  # OUTPUT: «Hash␤»
+
 =head1 Methods
 
 =head2 method classify-list