✍️ Grammatical Correction in `current_output/1` Documentation

[coderabbitai[bot]]

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A grammatical correction is needed in the documentation for the current_output/1 predicate. The phrase 'Here's the steps' should be corrected to 'Here are the steps' for grammatical accuracy.

This issue is to track the correction mentioned in the PR discussion: https://github.com/okp4/okp4d/pull/606#discussion_r1533418217

@ccamel has agreed to address this in a future PR. This ticket is created to ensure the task is tracked appropriately.