fix grammatical error in installation.md (#953)

avoid repetition of conjunction, that.
and change 'vite' to 'Vite'.

Author: idorenyinudoh

src/guide/installation.md

@@ -98,7 +98,7 @@ $ yarn
 $ yarn dev
 ```
 
-It might occur, that when your username has a space in it like 'Mike Baker' that vite cannot succeed. Have a try with
+It might occur, that when your username has a space in it like 'Mike Baker', Vite cannot succeed. Have a try with
 
 ```bash
 $ create-vite-app <project-name>