Update expected data type of input array in real function

[antonwolfy]

This PR continues work done in #2041 and aligns expected data type of real function with the implementation.

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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_136 ran successfully.
Passed: 1106
Failed: 4
Skipped: 119

[coveralls]

coverage: 86.392%. remained the same
when pulling 70e173c on update-ufuncs-docstrings
into ab98697 on master.