message: Fix dead self-link
diff: @@ -164,7 +164,7 @@ doesn't expose any environment to the program, so running
  `RUST_BACKTRACE=1 cargo miri test` will not do what you expect.
  To get a backtrace, you need to disable isolation
  -[using `-Zmiri-disable-isolation`](#miri-flags):
  +[using `-Zmiri-disable-isolation`][miri-flags]:
  ```sh
  RUST_BACKTRACE=1 MIRIFLAGS="-Zmiri-disable-isolation" cargo miri test
  