message: fix openexr doc
diff: @@ -77,7 +77,7 @@ impl<R: Read + Seek> OpenExrDecoder<R> {
  // check if r/g/b exists in the channels
  let has_rgb = ["R","G","B"].iter().all(|&required| // alpha will be optional
  header.channels.find_index_of_channel(&Text::from(required)).is_some()
  - );
  + );s
  // we currently dont support deep images, or images with other color spaces than rgb
  !header.deep && has_rgb
  @@ -210,8 +210,7 @@ impl<'a, R: 'a + Read + Seek> ImageDecoder<'a> for OpenExrDecoder<R> {
  /// Write a raw byte buffer of pixels,
  -/// returning an Error if the buffer is not aligned to `f32`
  -/// or if it has an invalid length.
  +/// returning an Error if it has an invalid length.
  ///
  /// Assumes the writer is buffered. In most cases,
  /// you should wrap your writer in a `BufWriter` for best performance.
  @@ -311,9 +310,7 @@ impl<W> ImageEncoder for OpenExrEncoder<W> where W: Write + Seek {
  /// Writes the complete image.
  ///
  - /// Returns an Error if the buffer is not aligned to `f32`
  - /// or if it has an invalid length.
  - ///
  + /// Returns an Error if it has an invalid length.
  /// Assumes the writer is buffered. In most cases,
  /// you should wrap your writer in a `BufWriter` for best performance.
  fn write_image(self, buf: &[u8], width: u32, height: u32, color_type: ColorType) -> ImageResult<()> {
  