Documentation for `array_to_img`, `img_to_array` and `save_img` under `preprocessing.image` #12711 (#13252)
Documentation for `array_to_img`, `img_to_array` and `save_img` under `preprocessing.image` #12711 (#13252)

* Add docstring of `save_img()` in `keras/preprocessing/image.py`

Signed-off-by: Karel Ha <70f8965fdfb04f1fc0e708a55d9e822c449f57d3@gmail.com>

* Add docstring of `img_to_array()` in `keras/preprocessing/image.py`

Signed-off-by: Karel Ha <70f8965fdfb04f1fc0e708a55d9e822c449f57d3@gmail.com>

* Add docstring of `array_to_img()` in `keras/preprocessing/image.py`

Signed-off-by: Karel Ha <70f8965fdfb04f1fc0e708a55d9e822c449f57d3@gmail.com>

keras-team/keras,keras-team/keras