fix typo

Author: Lucien Grondin

S07-lists.pod

@@ -218,7 +218,7 @@ return a C<Seq>, as do most synchronous sources of multiple values.
     say (1, 1, * + * ... *).^name;   # Seq
     say $*IN.lines.^name;            # Seq
 
-Since a C<Seq> will not by default remember is values, it can only be
+Since a C<Seq> will not by default remember its values, it can only be
 consumed once. For example, if a C<Seq> is stored:
 
     my \seq = (1, 2, 3).map(* + 1);