Fix typo

Author: lizmat

doc/Language/operators.pod6

@@ -2362,7 +2362,7 @@ This allows you to write
 To generate all Fibonacci numbers up to but excluding 100.
 
 The C<...> operators consider the initial values as "generated elements" as
-well, so the are also checked against the endpoint:
+well, so they are also checked against the endpoint:
 
     my $end = 4;
     say 1, 2, 4, 8, 16 ... $end;