Doc'd purpose of "Database backend API" backwards incompatible changes section.
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@ -236,6 +236,9 @@ Backwards incompatible changes in 2.1
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Database backend API
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--------------------
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This section describes changes that may be needed in third-party database
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backends.
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* To adhere to :pep:`249`, exceptions where a database doesn't support a
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feature are changed from :exc:`NotImplementedError` to
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:exc:`django.db.NotSupportedError`.
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@ -280,6 +280,9 @@ Backwards incompatible changes in 2.2
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Database backend API
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--------------------
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This section describes changes that may be needed in third-party database
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backends.
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* Third-party database backends must implement support for table check
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constraints or set ``DatabaseFeatures.supports_table_check_constraints`` to
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``False``.
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