Adds new routine to Routine and wraps, Raku#4002

doc/Type/Routine.pod6

@@ -51,10 +51,9 @@ Returns the package in which the routine is defined.
 
     method multi(Routine:D: --> Bool:D)
 
-Returns C<True> if the routine is a multi sub or method. Note that
-the name of a multi sub refers to its L<C<proto>|/syntax/proto> and this method would
-return false if called on it. It needs to be called on the
-candidates themselves:
+Returns C<True> if the routine is a multi sub or method. Note that the name of a
+multi sub refers to its L<C<proto>|/syntax/proto> and this method would return
+false if called on it. It needs to be called on the candidates themselves:
 
     multi foo ($, $) {};
     say &foo.multi;             # OUTPUT: «False␤»
@@ -101,6 +100,15 @@ L<wrap|/routine/wrap>. While the signature allows any type to be passed, only
 the L<C<Routine::WrapHandle>|/type/Routine::WrapHandle> type returned from
 C<wrap> can usefully be.
 
+=head2 method is-wrapped
+
+Defined as:
+
+    method is-wrapped()
+
+Returns C<True> or C<False>, depending on the wrappedness of the affected
+C<Routine>.
+
 =head2 method yada
 
     method yada(Routine:D: --> Bool:D)