Update 7.state-management.md

- Removed additional variable example

docs/1.getting-started/7.state-management.md

@@ -192,7 +192,6 @@ const date = useLocaleDate(new Date('2016-10-26'))
 By using [auto-imported composables](/docs/guide/directory-structure/composables) we can define global type-safe states and import them across the app.
 
 ```ts twoslash [composables/states.ts]
-export const useCounter = () => useState<number>('counter', () => 0)
 export const useColor = () => useState<string>('color', () => 'pink')
 ```