chore: fix typos in tracing-appender's README (tokio-rs#1780)

tracing-appender/README.md

@@ -53,7 +53,7 @@ This crate can be used in a few ways to record spans/events:
  - Using *any* type implementing [`std::io::Write`][write] in a 
  non-blocking fashion.
  - Using [`NonBlocking`][non_blocking] and [`RollingFileAppender`][file_appender] 
- together to write to write to log files in a non-blocking fashion.
+ together to write to log files in a non-blocking fashion.
 
 ## Rolling File Appender
 
@@ -137,7 +137,7 @@ fn main() {
 [tracing]: https://docs.rs/tracing/latest/tracing/
 [make_writer]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/fmt/trait.MakeWriter.html
 [write]: https://doc.rust-lang.org/std/io/trait.Write.html
-[non_blocking]: https://docs.rs/tracing-appender/latest/tracing_appender/non_blocking/indexx.html
+[non_blocking]: https://docs.rs/tracing-appender/latest/tracing_appender/non_blocking/index.html
 [rolling]: https://docs.rs/tracing-appender/latest/tracing_appender/rolling/index.html
 [guard]: https://docs.rs/tracing-appender/latest/tracing_appender/non_blocking/struct.WorkerGuard.html
 [file_appender]: https://docs.rs/tracing-appender/latest/tracing_appender/rolling/struct.RollingFileAppender.html