[docs] Type on the 26.1 typing page

[Jon Tetlak]

26.1. typing — Support for type hints — Python 3.5.1 documentation

https://docs.python.org/3/library/typing.html

At the top section, in the last sentence, ..."expected to by of type
str"... should say *be *instead of *by *correct? Really minor typo, but
found it and figured I would pass it along.
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