move index entry for empty list to List

Author: gfldex

doc/Language/operators.pod6

@@ -396,7 +396,6 @@ appropriate number.
 
 The X<grouping operator>.
 
-X<|(),empty list>
 An empty group C<()> creates an empty L<List> .
 Parentheses around non-empty expressions simply structure the expression, but
 not have additional semantics.

doc/Type/List.pod6

@@ -64,8 +64,9 @@ Slurpy parameters (C<*@a>) flatten non-itemized sublists:
     say fe(<a b>, <d e>);           # 4
     say fe(<a b>, <d e>.item);      # 3
 
-The empty list is created with C<()>. Smartmatching against the empty list will
-check for the absence of elements.
+<|(),empty list>
+The emtpy list is created with C<()>. Smartmatching against the empty list will
+check for the absense of elements.
 
     my @a;
     for @a, @a.list, @a.Seq -> \listoid {