Description

Added explanation of the children prop to the React props lesson to help learners.

Changes

• Added a new section explaining the special children prop in React
• Included a practical code example showing how to use children for wrapping UI elements
• Demonstrated the rendered output to clarify how the pattern works

Motivation and Context

The lesson covered props well but didn't explain the children prop, which is a fundamental React pattern for component composition. This addition addresses issue #64645 by providing learners with information about the children prop.

How Has This Been Tested?

• Tested locally by running pnpm run develop at http://localhost:8000
• Verified the markdown renders correctly
• Confirmed code examples display properly
• Checked that the new content flows naturally with existing lesson material

Screenshots:

Checklist:

• I have read and followed the contribution guidelines.
• I have read and followed the how to open a pull request guide.
• My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or GitHub Codespaces.

Closes #64645