mention Zen slice, need for parens in P5's list x

lib/Language/5to6.pod

@@ -380,6 +380,12 @@ That new feature corresponds Perl 6 C<.list> and C<.hash> methods:
         my @a = $arrayref.list;
         my %h = $hashref.hash;
 
+The "Zen" slice does the same thing:
+
+    # Perl 6
+        my @a = $arrayref[];
+        my %h = $hashref{};
+
 See S32/Containers
 
 =head2 Operators
@@ -525,8 +531,8 @@ In Perl 5, C<x> was the Repetition operator.
 In scalar content, C<x> would repeat a string. In Perl 6, C<x> repeats
 strings in any context.
 
-In list content, C<x> would repeat a list. In Perl 6, the new C<xx> op
-repeats lists in any context.
+In list content, C<x> would repeat a list—but only if the left argument
+is parenthesized! In Perl 6, the new C<xx> op repeats lists in any context.
 
 Mnemonic: x is short and xx is long, so xx is the one used for lists.