add missing manchester image

### Link to the page

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

### Steps to reproduce

navigate to 'five fun facts' website
the image for manchester on the second row is missing

Open the linked GitHub Pages site and inspect the “Five Fun Facts” page, focusing on the second row where the Manchester image is missing. Find the page source and its image reference, then verify that the Manchester image displays in the correct position after the change.

索引モデルが issue の本文から書いたものです。