Updated expected dtypes of input arrays in docstrings of elementwise functions

[antonwolfy]

This PR updates docstrings of elementwise functions to add expected dtype of input arrays where missing, to align the dtypes with implementation and to fix some typos which were identified.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_108 ran successfully.
Passed: 893
Failed: 3
Skipped: 154

[coveralls]

coverage: 86.381% (+0.003%) from 86.378%
when pulling c138cea on update-ufuncs-docstrings
into e39b013 on master.

[ndgrigorian]

Other than the above comment I think this would be fine to go in, thanks for taking the time for this @antonwolfy

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_117 ran successfully.
Passed: 912
Failed: 2
Skipped: 154

[ndgrigorian]

LGTM!