Adjusts wording of comparison function docs

[ndgrigorian]

This PR adjusts the wording of the documentation for comparison functions dpctl.tensor.less, dpctl.tensor.less_equal, dpctl.tensor.greater, dpctl.tensor.greater_equal.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1242/index.html

[coveralls]

coverage: 84.117%. remained the same when pulling 5af4637 on docs-changes-elementwise into 81553f8 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.3=py310h7bf5fec_2 ran successfully.
Passed: 388
Failed: 612
Skipped: 119

[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=0.14.3=py310h7bf5fec_2 ran successfully.
Passed: 387
Failed: 613
Skipped: 119