message: Fix small typo in reference/profiles.md
diff: @@ -158,7 +158,7 @@ dependencies will also be forced to built with the `unwind` strategy.
  The `incremental` setting controls the [`-C incremental` flag] which controls
  whether or not incremental compilation is enabled. Incremental compilation
  -causes `rustc` to to save additional information to disk which will be reused
  +causes `rustc` to save additional information to disk which will be reused
  when recompiling the crate, improving re-compile times. The additional
  information is stored in the `target` directory.
  