[docs] [issue29725] sqlite3.Cursor doesn't properly document "arraysize"

[Berker Peksag]

Berker Peksag added the comment:

> There is another attribute called row_factory in the cursor structure
> that isn't in the docs.  There is a row_factory defined in the docs,
> but that one is for the connection structure.  Should it be added under
> cursor as well?

Thank you for working on this issue, Cheryl. Cursor.row_factory is there for backwards compatibility reasons so we can't remove it until we retire Python 2.

For example, pysqlite has already been removed it in version 2.8.0 [1] but they don't have a strict backwards compatibility policy since their user base is much smaller than us and it only supports Python 2.

[1] https://github.com/ghaering/pysqlite/commit/10dbbe4cca7487a3c65776186b3fb4ceeab5e8fa

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<http://bugs.python.org/issue29725>
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