remove duplicate

Author: coke

doc/Type/Exception.pod6

@@ -146,7 +146,7 @@ die "Important reason";
 If the subroutine form is called without arguments, the value of
 L«C<$!> variable|/syntax/$!» is checked. If it is set to a
 L«C<.DEFINITE>|/language/mop#index-entry-syntax_DEFINITE-DEFINITE»
-value, its value will be used as the the L<Exception> to throw if it's
+value, its value will be used as the L<Exception> to throw if it's
 of type L<Exception>, otherwise, it will be used as payload of L<X::AdHoc>
 exception. If C<$!> is not C<.DEFINITE>, L<X::AdHoc> with string C<"Died">
 as payload will be thrown.