[docs] Tiny typos in https://docs.python.org/3/library/weakref.html#weakref.WeakValueDictionary

[Arthur Goldberg]

s/have the following additional methods. These method have/have the 
following additional method. This method has/
s/ issues as the and|keyrefs()|/ issues as the|keyrefs()|/

HTH
A

-- 
Arthur Goldberg
https://www.linkedin.com/in/arthurgoldberg
artgoldberg at gmail.com

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