Move a paragraph about named parameters in multi sub documentation.

See issue #2026

doc/Language/functions.pod6

@@ -287,6 +287,10 @@ happy-birthday age => 40, name => 'Luca';  # OUTPUT: «Happy Birthday Luca, you
 
 =end code
 
+Named parameters participate in the dispatch even if they are not provided in
+the call. Therefore a multi candidate with named parameters will be given
+precedence.
+
 For more information about type constraints see the documentation
 for the L<Signature|/type/Signature#Type_Constraints> class.
 
@@ -299,9 +303,6 @@ for the L<Signature|/type/Signature#Type_Constraints> class.
     say as-json( [ True, 10.3, False, 24 ] );   # OUTPUT: «[true, 10.3, false, 24]␤»
 
 
-Named parameters participate in the dispatch even if they are not provided in
-the call. Therefore a multi candidate with named parameters will be given
-precedence.
 
 C<multi> without any specific routine type always defaults to a C<sub>, but you
 can use it on methods as well. The candidates are all the multi methods of the