fix: Update install method for Bun (#64151)

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### What?
So, i was trying to create a Next.js project with Bun as i was
experimenting with it and i got error creating the project `error: could
not determine executable to run for package create` so i added `-` after
create and works and created by project successfully.

## Before


![image](https://github.com/vercel/next.js/assets/53424436/d27fd404-c462-4fc7-aa06-a1743f57d551)

## After

![image](https://github.com/vercel/next.js/assets/53424436/3804735f-3b59-4dac-a97e-672a533a38be)

---------

Co-authored-by: JJ Kasper <jj@jjsweb.site>

docs/02-app/02-api-reference/06-create-next-app.mdx

@@ -26,7 +26,7 @@ pnpm create next-app
 ```
 
 ```bash filename="Terminal"
-bunx create next-app
+bunx create-next-app
 ```
 
 You will then be asked the following prompts: