fix typos

Author: coke

doc/Type/List.pod6

@@ -65,8 +65,8 @@ Slurpy parameters (C<*@a>) flatten non-itemized sublists:
     say fe(<a b>, <d e>.item);      # 3
 
 <|(),empty list>
-The emtpy list is created with C<()>. Smartmatching against the empty list will
-check for the absense of elements.
+The empty list is created with C<()>. Smartmatching against the empty list will
+check for the absence of elements.
 
     my @a;
     for @a, @a.list, @a.Seq -> \listoid {