message: FilterCollector doc fix
  Other types supported since
diff: @@ -16,7 +16,7 @@ use crate::fastfield::{DynamicFastFieldReader, FastFieldReader, FastValue};
  use crate::schema::Field;
  use crate::{Score, SegmentReader, TantivyError};
  -/// The `FilterCollector` collector filters docs using a u64 fast field value and a predicate.
  +/// The `FilterCollector` collector filters docs using a fast field value and a predicate.
  /// Only the documents for which the predicate returned "true" will be passed on to the next collector.
  ///
  /// ```rust
  