different bullet point for Birmingam

### Link to the page

https://github.com/CodeYourFuture/github_issues_prs_practice/blob/main/index.html

### Steps to reproduce

all the cities have same bullet point but Birmingam has different bullet

Open index.html from the linked page and inspect the city list, comparing Birmingham's bullet point with the other cities. Update the inconsistent bullet so Birmingham uses the same format, then verify in the rendered page that all city bullets match.

索引モデルが issue の本文から書いたものです。