(NFC) Contribute/Product.xml - No newline in comment

[totten]

Overview

This does a small normalization of the XML<comment>. It makes it easier to run the converter (xml/schema/**.xml ==> schema/*.entityType.php)

Before

The converter is confused by the multiline string. It skips ts() wrapping.

After

The converter can handle it.

[civibot]

🤖 Thank you for contributing to CiviCRM! ❤️ We will need to test and review this PR. 👷

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