[docs] spelling mistake

[Eyal Miller]

hi,
i think in the first line of this page is a spelling error
https://docs.python.org/3.8/library/types.html

"This module defines utility function to assist in dynamic creation of new
types."
shouldn't it be:
...defines *a* utility function
or
defines utility function*s*
?

i hope I'm not wrong
eyal
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