message: Fix the method reference to with_guessed_format
  The previous documentation links to a method that was ultimately made
  private in a decision to make `Reader` behave like a builder style
  struct, and prioritize chaining with `self` over `&mut self` as it
  handles the non-Clone reader.
diff: @@ -69,9 +69,9 @@ impl<R: Read> Reader<R> {
  /// Create a new image reader without a preset format.
  ///
  /// It is possible to guess the format based on the content of the read object with
  - /// [`guess_format`], or to set the format directly with [`set_format`].
  + /// [`with_guessed_format`], or to set the format directly with [`set_format`].
  ///
  - /// [`guess_format`]: #method.guess_format
  + /// [`with_guessed_format`]: #method.with_guessed_format
  /// [`set_format`]: method.set_format
  pub fn new(reader: R) -> Self {
  Reader {
  @@ -118,9 +118,9 @@ impl Reader<BufReader<File>> {
  /// This will not attempt any io operation on the opened file.
  ///
  /// If you want to inspect the content for a better guess on the format, which does not depend
  - /// on file extensions, follow this call with a call to [`guess_format`].
  + /// on file extensions, follow this call with a call to [`with_guessed_format`].
  ///
  - /// [`guess_format`]: #method.guess_format
  + /// [`with_guessed_format`]: #method.with_guessed_format
  pub fn open<P>(path: P) -> io::Result<Self> where P: AsRef<Path> {
  Self::open_impl(path.as_ref())
  }
  