Improve exception raised by broadcast_arrays with no arguments

[ndgrigorian]

This PR improves the message of the ValueError raised by broadcast_arrays when called with no arguments.

Closes #1718

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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=0.18.0dev0=py310h15de555_80 ran successfully.
Passed: 894
Failed: 15
Skipped: 105

[coveralls]

coverage: 87.902% (-0.2%) from 88.057%
when pulling 21e1958 on fix-broadcast-arrays-no-args
into 26d34f5 on master.

[antonwolfy]

Thank you @ndgrigorian, LGTM!

[ndgrigorian]

Test failures in linux CI and coverage dip are unrelated to this PR. Test failure appears to be related to the release of 2024.2.0 (as it wasn't present prior).

I will go ahead and merge this and continue to investigate the CI in a separate PR, so that this can move to the dev milestone.