Missing comma

Author: AlexDaniel

doc/Language/operators.pod6

@@ -834,7 +834,7 @@ Coerces the argument to L<Str> by calling the C<Str> method on it.
 
 =head2 prefix C«|»
 
-Flattens objects of type L<Capture>, L<Pair>, L<List> L<Map> and L<Hash>
+Flattens objects of type L<Capture>, L<Pair>, L<List>, L<Map> and L<Hash>
 into an argument list.
 
 Outside of argument lists, it returns a L<Slip|/type/Slip>, which makes it