Motivation and Mindset: Replace 'checkout' with 'check out' and apply hyperlink to 'this article' instead

[SuleymanCommits]

Because

It fixes a grammatical error. Checkout is a noun that refers to taking items out of a store after paying. Check out is the intended verb here.
It also changes the hyperlink to point to 'this article' instead of 'more information on breaks and productivity' as that is more in line with web standards.

This PR

• Replace improper noun 'checkout' with proper verb 'check out'

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
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• If any lesson files are included in this PR, they follow the Layout Style Guide

[SuleymanCommits]

I would argue that 'this article' should be part of the hyperlink

[SuleymanCommits]

maybe even apply the hyperlink only to 'this article' and not 'more information on breaks & productivity'? Thoughts?

[SuleymanCommits]

never mind, my bad, I'll open a new PR for 'checkout' to 'check out'. Sorry for the clutter.