Update hello.php

[18pixels]

Updated Some whitespace.

Trac ticket:

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

Hi @18pixels! 👋

Thank you for your contribution to WordPress! 💖

It looks like this is your first pull request to wordpress-develop. Here are a few things to be aware of that may help you out!

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[github-actions]

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[github-actions]

Trac Ticket Missing

This pull request is missing a link to a Trac ticket. For a contribution to be considered, there must be a corresponding ticket in Trac.

To attach a pull request to a Trac ticket, please include the ticket's full URL in your pull request description. More information about contributing to WordPress on GitHub can be found in the Core Handbook.

[github-actions]

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