rm second-person

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

tracing-subscriber/src/fmt/writer.rs

@@ -44,9 +44,8 @@ use std::{
 /// ```
 ///
 /// A closure can be used to introduce arbitrary logic into how the writer is
-/// created. For example, this will send every 5th event to stderr, and all
-/// other events to stdout (why you would actually want to do this, I have no
-/// idea, but you _can_):
+/// created. Consider the (admittedly rather silly) example of sending every 5th
+/// event to stderr, and all other events to stdout:
 ///
 /// ```
 /// use std::io;