IO::Path.x gives false-positives for scripts

Add a note saying so. May this save some future reader some grief.

Author: patrickbkr

doc/Type/IO/Path.pod6

@@ -711,6 +711,11 @@ Returns C<True> if the invocant is a path that exists and is executable.
 The method will L«C<fail>|/routine/fail» with C<X::IO::DoesNotExist> if the
 path points to a non-existent filesystem entity.
 
+B<NOTE:> If the file is a script (an executable text file and not a native executable),
+and the file has I<only> executable permissions and I<no> read permissions,
+this method will return C<True> but trying to execute will fail. That is a
+limitation of the operating system.
+
 =head2 method rwx
 
 Defined as: