Document Signature.ACCEPTS can't see into where clauses

Author: zoffixznet

doc/Type/Signature.pod6

@@ -796,6 +796,13 @@ and follows the same semantics as L<Capture> C<$topic>:
     42         ~~ :(Int);         # RESULT: «False» (Int.Capture throws)
     set(<a b>) ~~ :(:$a, :$b);    # RESULT: «True»
 
+Since L«C<where> clauses|/type/Signature#index-entry-where_clause_(Signature)»
+are not introspectable, the method cannot determine whether one signature
+L<ACCEPTS> the same sort of C<where>-constrained parameter. Such such comparisons
+will return C<False>. This includes signatures with literals, which are just
+sugar for the C<where>-constraints:
+
+    say :(42) ~~ :($ where 42)    # OUTPUT: «False␤»
 
 =head2 method Capture