Adds missing input labels

[nick-mon1]

Summary

Adds missing labels to input fields in markdown content.

Preview

Link to Preview

Solution

Before

  <input type="checkbox">Review the <a href="{{< ref "/guides/hcd/discovery-concepts/do-research.md" >}}">research section of the HCD Discovery Concepts Guide.</a>
  </input>
<br>

After

<label for="review">
  <input id="review" type="checkbox">Review the <a href="{{< ref "/guides/hcd/discovery-concepts/do-research.md" >}}">research section of the HCD Discovery Concepts Guide.</a>
  </input>
</label>
<br>

[github-actions]

🔍 Preview in Federalist

[nick-mon1]

What I Tested

• ran wave extension to see passing validations for label for each input
• approved ✅

[ToniBonittoGSA]

Switch from implicit labels to explicit labels; details in JIRA 164