doc Mu.return and Mu.return-rw

doc/Type/Mu.pod6

@@ -288,6 +288,24 @@ are marked as C<is export>.
 
 See L<Exporting and Selective Importing Modules|/language/modules#Exporting_and_Selective_Importing>
 for more details.
+=head2 method return
+
+    method return();
+
+The method C<return> will stop execution of a subroutine or method, run all
+relevant L<phasers|/language/phasers#Block_Phasers> and provide invocant as a
+return value to the caller. If a return
+L<type constraint|/type/Signature#Constraining_Return_Types> is provided it will be
+checked unless the return value is C<Nil>. A control exception is raised and
+can be caught with L<CONTROL|/language/phasers#CONTROL>.
+
+    sub f { (1|2|3).return };
+    dd f(); # OUTPUT«any(1, 2, 3)␤»
+
+=head2 method return-rw
+
+Same as method L<C<return>|/type/Mu#return> but provides the invocant as a
+writeable container to the invocant.
 
 =head2 method take