Update v-model.md

[CDT]

the pre 3.4 usage of defineModel('title', { required: true }) is missing the required: true property

Description of Problem

In the pre 3.4 usage code of defineModel('title', { required: true }), the required: true property is missing

Proposed Solution

Changed defineProps(['title']) to

defineProps({
  title: {
    required: true 
  }
})

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