Fixes #1050: removes instructions for visualize_dataset.py

[brainwavecoder9]

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What this does

This PR fixes #1050 which is a minor issue in documentation

How it was tested

Nothing to test, only changes comment for help section.

How to checkout & try? (for the reviewer)

Only need to review instructions in help section. Easy to see diff.

CREDIT:

This issue was identified by @LaurentBerger I am only submitting to close the issue.