Adding description for .form-control (Challenge: Style text inputs as form controls)

[n-white]

Pre-Submission Checklist

• Your pull request targets the staging branch of FreeCodeCamp.
• Branch starts with either fix/, feature/, or translate/ (e.g. fix/signin-issue)
• You have only one commit (if not, squash them into one commit).
• All new and existing tests pass the command npm run test-challenges. Use git commit --amend to amend any fixes.

Type of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)
• Add new translation (feature adding new translations)

Checklist:

• Tested changes locally.
• Closes currently open issue (replace XXXX with an issue no): Closes Adding description for form-controls #10320

Description

Adding an extra line of information to describe what adding the form-control class to the input field actually does.

[ghost]

✨ ✨ LGTM 👍 ✨ ✨

🎉 Thanks for contributing @n-white and congratulations on your first PR submission to FreeCodeCamp!