Added docs for Mu.does. RabidGravy++

doc/Type/Mu.pod

@@ -48,6 +48,24 @@ A more idiomatic way to do this is to use the smartmatch operator L<~~|/routine/
     my $s = "String";
     say $s ~~ Str;       # True
 
+=head2 routine does
+
+    method does(Mu $type)      returns Bool:D
+
+Returns True if and only if the invocant conforms to type C<$type>.
+
+    my $d = Date.new('2016-06-03');
+    say $d.does(Dateish);             # True    (Date does role Dateish)
+    say $d.does(Any);                 # True    (Date is a subclass of Any)
+    say $d.does(DateTime);            # False   (Date is not a subclass of DateTime)
+
+Using the smart match operator L<~~|/routine/~~> is a more idiomatic alternative.
+
+    my $d = Date.new('2016-06-03');
+    say $d ~~ Dateish;                # True
+    say $d ~~ Any;                    # True
+    say $d ~~ DateTime;               # False
+
 =head2 routine Bool
 
     multi sub    Bool(Mu) returns Bool:D