Update tracing-subscriber/src/filter/layer_filters.rs

Co-authored-by: David Barsky <me@davidbarsky.com>

Author: hawkw

tracing-subscriber/src/filter/layer_filters.rs

@@ -130,7 +130,7 @@ pub(crate) struct FilterMap {
 /// bit, so that the `FilterMap` has been cleared for the next set of
 /// `enabled` calls.
 ///
-/// This is also read by the `Registry`, for two reasons:
+/// FilterState is also read by the `Registry`, for two reasons:
 ///
 /// 1. When filtering a span, the Registry must store the `FilterMap`
 ///    generated by `Filtered::enabled` calls for that span as part of the