Added docs for method 'dynamic'. jnthn++

Author: Jan-Olof Hendig

doc/Type/Hash.pod6

@@ -611,6 +611,33 @@ returns C<(Mu)>.
     my Int %h2 = 'oranges' => 7;             # (values must be of type Int)
     say %h2.of;                              # OUTPUT: «(Int)␤»
 
+=head2 routine dynamic
+
+Defined as:
+
+    method dynamic(--> Bool:D)
+
+Returns C<True> if the invocant has been declared with the L<is dynamic|/routine/is dynamic>
+trait.
+
+    my %a;
+    say %a.dynamic;                          # OUTPUT: «False␤»
+
+    my %b is dynamic;
+    say %b.dynamic;                          # OUTPUT: «True␤»
+
+If you declare a variable with the C<*> twigil C<is dynamic> is implied.
+
+    my %*b;
+    say %*b.dynamic;                         # OUTPUT: «True␤»
+
+Note that in the L<Scalar> case you have to use the C<VAR> method in
+order to get correct information.
+
+    my $s is dynamic = %('apples' => 5);
+    say $s.dynamic;                          # OUTPUT: «False␤»  (wrong, don't do this)
+    say $s.VAR.dynamic;                      # OUTPUT: «True␤»   (correct approach)
+
 =head1 Subscript Adverbs
 
 Some methods are implemented as adverbs on subscripts.