Correct a misspelling on the Data Visualization > Emphasis page

[marteki]

Hat tip to @chosak for finding this error.

Changes

• Change the incorrect word 'you' to 'your'.
• Remove some odd spaces introduced at the start of two lines.

Checklist

• [x] Changes are limited to a single goal (no scope creep)
• [x] Code can be automatically merged (no conflicts)
• [x] Code follows the standards laid out in the front end playbook
• [x] Passes all existing automated tests
• [x] New functions include new tests
• [x] New functions are documented (with a description, list of inputs, and expected output)
• [x] Placeholder code is flagged
• [x] Visually tested in supported browsers and devices
• [x] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)