remove use of "we"

tracing/src/instrument.rs

@@ -233,10 +233,9 @@ pub trait WithCollector: Sized {
  /// // run on a different thread, in a different default collector's context.
  /// tokio::spawn(future);
  ///
- /// // However, if we call `with_current_collector` on the future before
- /// // spawning it, we can ensure that the current thread's default
- /// // collector is propagated to the spawned task, regardless of where
- /// // it executes:
+ /// // However, calling `with_current_collector` on the future before
+ /// // spawning it, ensures that the current thread's default collector is 
+ /// // propagated to the spawned task, regardless of where it executes:
  /// # let future = async { };
  /// tokio::spawn(future.with_current_collector());
  /// # }