Clarify Array Slicing Syntax from 'array[start:stop[:step]]' to 'array[start:stop:step]'

[kazakhpunk]

This pull request updates the array slicing syntax documentation. The original syntax notation 'array[start:stop[:step]]' could be misinterpreted as suggesting the step parameter is nested within the stop parameter. This update simplifies the notation to 'array[start:stop:step]', clearly delineating each parameter, enhancing readability and reducing potential confusion for users.

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[dopplershift]

The challenge with this update is now it implies that the second colon is mandatory, which isn't true. That's why :step was in its own brackets before.

In fairness, neither the numpy docs nor the Python docs denote slicing as we have previously done here, so maybe this is a good cleanup to match those sources.

[kazakhpunk]

Thank you for the feedback. I appreciate the concern about the notation implying that the second colon and the step parameter are mandatory.

I propose we adopt 'array[start:stop:step]' as the primary notation in examples but include a clear note in the text explaining that the step parameter is optional: "The step parameter is optional and can be omitted, in which case the slice uses a default step of 1."

[kazakhpunk]

Thank you for this feedback!

I've changed array[start:stop:step]' toarray[start:stop:step]`

[brian-rose]

Merging this now. Thanks for the contribution @kazakhpunk!