missing bullet point about London

### Why are we doing this?

the bullet fun facts are expected to be five but we have only four about London.

### Submission & Review

make the bullet points 5.

Inspect the repository's HTML content to find the London fun-facts list. Add one bullet so the list contains five items, then verify the rendered or source list has five London facts.

由索引模型根據 Issue 內容生成。