Update Prose-Style-Guidelines.md

[SFU-TechnicalWriter]

Some users may not understand the usage of the word “trump” in this context, and therefore simpler words could be used without changing the meaning.

• [ x] Have you followed the guidelines in our Contributing document?
• [x ] Have you checked to ensure there aren't other open Pull Requests for the same change?
• [x ] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ x] Have you written new tests for your changes? Here's an example.
• [x ] Have you successfully run brew style with your changes locally?
• [x ] Have you successfully run brew tests with your changes locally?

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[MikeMcQuaid]

Thanks so much for your first contribution (hopefully of many)! Without people like you submitting PRs we couldn't run this project. You rock, @SFU-TechnicalWriter!