Do not promote `None` as the first argument to `filter` in documentation.

[Kirill Balunov]

2018-03-06 16:35 GMT+03:00 Chris Green <cl at isbd.net>:

> It's 'deprecation', depreciation is something quite different.  People
> replying have spelt it correctly so you might possibly have noticed I
> thought/hoped.
>
> ... and it does matter a bit because it's not just a mis-spelling, the
> word you are using has its own meaning and could thus cause confusion.
>
> ... and, yes, I know it's a very common and easily made mistake. :-)
>
>
I did not ;) Thank you!

With kind regards,
-gdg