Fixed #8848: clarified custom file storage backend docs in light of the more clear code comments.

Writing a custom storage system

===============================

.. currentmodule:: django.core.files.storage

If you need to provide custom file storage -- a common example is storing files

on some remote system -- you can do so by defining a custom storage class.

You'll need to follow these steps:

   the ``path()`` method.

Your custom storage system may override any of the storage methods explained in

:ref:`ref-files-storage`. However, it's usually better to use the hooks

specifically designed for custom storage objects. These are:

:ref:`ref-files-storage`, but you **must** implement the following methods:

    * :meth:`Storage.delete`

    * :meth:`Storage.exists`

    * :meth:`Storage.listdir`

    * :meth:`Storage.size`

    * :meth:`Storage.url`

You'all also usually want to use hooks specifically designed for custom storage

objects. These are:

``_open(name, mode='rb')``

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