Fix link to V3 (Vue 2) documentation

[dhritzkiv]

Fix link to v3 (for Vue 2) documentation, as https://apollo.vuejs.org links to current documentation

[pkg-pr-new]

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@vue/apollo-components

npm i https://pkg.pr.new/vuejs/apollo/@vue/apollo-components@1588

@vue/apollo-composable

npm i https://pkg.pr.new/vuejs/apollo/@vue/apollo-composable@1588

@vue/apollo-option

npm i https://pkg.pr.new/vuejs/apollo/@vue/apollo-option@1588

@vue/apollo-ssr

npm i https://pkg.pr.new/vuejs/apollo/@vue/apollo-ssr@1588

@vue/apollo-util

npm i https://pkg.pr.new/vuejs/apollo/@vue/apollo-util@1588

commit: 95064a1