Fix thinko.

doc/Language/operators.pod6

@@ -2486,7 +2486,7 @@ all-sensors-down Nil, 42, Nil
 say first-working-sensor Nil, 42, Nil;  # OUTPUT:«42␤»
 =end code
 
-The C<andthen> operator is a close relative of
+The C<notandthen> operator is a close relative of
 L«C<without> statement modifier|/syntax/with orwith without», and some compilers
 compile C<without> to C<notandthen>, meaning these two lines have equivalent
 behaviour: