Spotted a typo in https://docs.python.org/3/library/quopri.html: "must be provideda"

But I also can't extract the meaning of the sentence:

> quotetabs, a flag which controls whether to encode embedded spaces and tabs must be provideda and when true it encodes such embedded whitespace, and when false it leaves them unencoded.

So here's the diff from 99597c4d12e358174275945d97e504c0318a3783:

+ *quotetabs*, a flag which controls whether to encode embedded spaces and tabs must be provideda and when true it encodes such embedded whitespace, and when false it leaves them unencoded.
- *quotetabs* is a flag which controls whether to encode embedded spaces and tabs; when true it encodes such embedded whitespace, and when false it leaves them unencoded.

So the "must be provided" has been added, I propose:

*quotetabs*, a non-optional flag which controls whether to encode embedded spaces and tabs; when true it encodes such embedded whitespace, and when false it leaves them unencoded.

Thanks! I like your proposed change.

Please create the PR.

New changeset 9424dcbb3e20a26dfdd81659303b989f7d3da044 by Mariatta (Julien Palard) in branch 'master':
bpo-32701: Clarify the quotetabs flag in quopri documentation (GH-5401)
https://github.com/python/cpython/commit/9424dcbb3e20a26dfdd81659303b989f7d3da044

New changeset 04f99ba9d7186278eaf072e9a62c03aa63a8a6bb by Mariatta (Miss Islington (bot)) in branch '3.6':
bpo-32701: Clarify the quotetabs flag in quopri documentation (GH-5401) (GH-5438)
https://github.com/python/cpython/commit/04f99ba9d7186278eaf072e9a62c03aa63a8a6bb

Thanks!