[2.1.x] Doc'd purpose of "Database backend API" backwards incompatible changes section.

Backport of f436c82637 from master.
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Tim Graham 2018-11-17 15:55:41 -05:00
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@ -236,6 +236,9 @@ Backwards incompatible changes in 2.1
Database backend API
--------------------
This section describes changes that may be needed in third-party database
backends.
* To adhere to :pep:`249`, exceptions where a database doesn't support a
feature are changed from :exc:`NotImplementedError` to
:exc:`django.db.NotSupportedError`.