message: fix typo (superfluous "o" after period).
diff: @@ -722,7 +722,7 @@ pub fn fetch(
  // repository. It could also fail, however, for a whole slew of other
  // reasons (aka network related reasons). We want Cargo to automatically
  // recover from corrupt repositories, but we don't want Cargo to stomp
  - // over other legitimate errors.o
  + // over other legitimate errors.
  //
  // Consequently we save off the error of the `fetch` operation and if it
  // looks like a "corrupt repo" error then we blow away the repo and try
  