Adds the list contextualizer @ refs #1711

Author: JJ

doc/Type/Any.pod6

@@ -99,6 +99,18 @@ does the L<Positional|/type/Positional> role
 from L«C<.list>|/routine/list». Use L«C<.List>|/routine/List» to
 coerce specifically to L<List|/type/List>.
 
+X<|@ list contextualizer>
+C<@> can also be used as a list or positional contextualizer
+
+=for code
+my $not-a-list-yet = $[1,2,3];
+say $not-a-list-yet.perl; # OUTPUT: «$[1, 2, 3]␤»
+my @maybe-a-list = @$not-a-list-yet;
+say @maybe-a-list.^name;  # Array␤»
+
+In the first case, the list is I<itemized>. C<@> as a prefix puts the initial
+scalar in a list context by calling C<.list> and turning it into an array.
+
 =head2 method push
 
 Defined as: