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.