✏️ Clean up documentation in install.md file

[Johandielangman]

I see there is a "///" markup at the bottom of https://typer.tiangolo.com/tutorial/install/

Not sure if this is a typo, so I created a PR. Apologies if this has been raised before and closed. Love this project!

[github-actions]

📝 Docs preview

Last commit e835809 at: https://6d4bd04a.typertiangolo.pages.dev

Modified Pages

• https://6d4bd04a.typertiangolo.pages.dev/tutorial/install/ - (before)

[Johandielangman]

📝 Docs preview

Last commit 45eead0 at: https://373082e0.typertiangolo.pages.dev

Modified Pages

• https://373082e0.typertiangolo.pages.dev/tutorial/install/ - (before)

This is amazing!

[svlandeg]

Nice catch, thank you!

[svlandeg]

There's actually slightly more going on here. #1522 should have removed the whole note section, from the first /// to the last ///. Because now, pip install typer is there twice on the page.