Update v-model.md
* Update v-model.md
> When it is mutated by the child, it causes the parent bound value to be updated as well.
Maybe adding a click event to invoke the update would help clarify the example?
* Update src/guide/components/v-model.md
Co-authored-by: Natalia Tepluhina <tarya.se@gmail.com>
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Co-authored-by: Natalia Tepluhina <tarya.se@gmail.com> (#58) #59
resolves #58 Cherry picked from https://github.com/vuejs/docs/commit/853eff61387f1aa6d71f951c53c78031e62ef7e4