[docs] Update options in create-next-app (#67455)

Documentation update, according to the last update of the `commander`
library. #66771

Co-authored-by: Jiwon Choi <devjiwonchoi@gmail.com>

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

@@ -53,7 +53,7 @@ Further, you can negate default options by prefixing them with `--no-` (e.g. `--
 See `create-next-app --help`:
 
 ```bash filename="Terminal"
-Usage: create-next-app <project-directory> [options]
+Usage: create-next-app [project-directory] [options]
 
 Options:
   -V, --version                        output the version number