Merge pull request #3297 from Raku/improve-wording

Improve wording

Author: JJ

doc/Type/Any.pod6

@@ -1365,7 +1365,8 @@ Coerces the invocant to a C<list> by applying
 its L«C<.list>|/routine/list» method and uses
 L«C<List.grep>|/type/List#routine_grep» on it.
 
-Based on C<$matcher> value can be either C<((Any))> or empty List.
+For undefined invocants, based on C<$matcher> the return value can
+be either C<((Any))> or the empty List.
 
     my $a;
     say $a.grep({ True }); # OUTPUT: «((Any))␤»