Update 2015-12-31-digitalgovs-2015-year-in-review.md

[ToniBonittoGSA]

add captions fix broken code

Summary

Basic description of work done. Closes [#issue_no].

Preview

[Link to Preview]()

Solution

How To Test

1. First Step
2. Second Step
3. Third Step

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Dev Checklist

• [ ] PR has correct labels
• [ ] A11y testing (voice over testing, meets WCAG, run axe tools)
• [ ] Code is formatted properly

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