Sheffield's fun facts is missed

### Link to the page

https://codeyourfuture.github.io/github_issues_prs_practice/

### Steps to reproduce

Please add one more part for Sheffield's fun fact.

Open the linked practice page and inspect how Sheffield's current fun facts are represented in the repository. Add one more Sheffield fun-fact section in the same format, then load the page to verify that the new content appears correctly.

索引モデルが issue の本文から書いたものです。