Fix ErrorVariant::message doctest
@@ -444,7 +444,7 @@ impl<R: RuleType> ErrorVariant<R> {
///
/// ```
/// # use pest::error::ErrorVariant;
- /// let variant = ErrorVariant::CustomError {
+ /// let variant = ErrorVariant::<()>::CustomError {
/// message: String::from("unexpected error")
/// };
///
