[docs] Small typo on CSV documentation

[Nat Dunn]

Hello,

There is a small bug at https://docs.python.org/3/library/csv.html. The
word "be" is repeated. I believe the first one (in red) should be removed.

Dialect.doublequote
<https://docs.python.org/3/library/csv.html#csv.Dialect.doublequote>

Controls how instances of *quotechar* appearing inside a field should
be themselves
be quoted.
Nat

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Nat Dunn
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