The computed usage provided in the documentation seems to be inconsistent with the type definition

When I use Vue 2 with TypeScript, I find that the computed method in the document is inconsistent with the definition in TS, have any good suggestions ?

https://github.com/vuejs/vuejs.org/blob/cac1ed9a7d6203904b45ede668c296deb3f3d06d/src/v2/api/index.md?plain=1#L586

https://github.com/vuejs/vue/blob/v2.6.14/types/options.d.ts#L44