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Rephrase typing.assert_never docs (#92061) 

This change is similar to that in #32069
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Shantanu 2022-04-29 21:13:21 -06:00 committed by GitHub
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@ -2337,7 +2337,7 @@ Functions and decorators
.. function:: assert_never(arg, /)
Assert to the type checker that a line of code is unreachable.
Ask a static type checker to confirm that a line of code is unreachable.
Example::
@ -2358,7 +2358,7 @@ Functions and decorators
reachable, it will emit an error. For example, if the type annotation
for ``arg`` was instead ``int | str | float``, the type checker would
emit an error pointing out that ``unreachable`` is of type :class:`float`.
For a call to ``assert_never`` to succeed, the inferred type of
For a call to ``assert_never`` to pass type checking, the inferred type of
the argument passed in must be the bottom type, :data:`Never`, and nothing
else.