docs: fix modelValue test example

The test was throwing an error `AssertionError: expected '' to be 'test'` because the input is of type number.

Author: ilyasherstoboev

docs/guide/advanced/v-model.md

@@ -89,10 +89,10 @@ test('modelValue and currency should be updated', async () => {
   })
 
   const [currencyInput, modelValueInput] = wrapper.findAll('input')
-  await modelValueInput.setValue('test')
+  await modelValueInput.setValue('100')
   await currencyInput.setValue('£')
 
-  expect(wrapper.props('modelValue')).toBe('test')
+  expect(wrapper.props('modelValue')).toBe('100')
   expect(wrapper.props('currency')).toBe('£')
 })
 ```