Installations: Remove mention of using echo in CLI basics

[mathdebate09]

Because

The way of creating files using echo has no reference in previous lessons and its better to have it removed

This PR

• Remove mention of echo from assignment step 3.3's hint (so the hint only mentions the touch command)

Issue

Closes #28323

Additional Information

nil

Pull Request Requirements

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• The Because section summarizes the reason for this PR
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