Documentation request: Vue testing library with Pinia

[scarletcs]

The examples page for Vue Testing Library (https://testing-library.com/docs/vue-testing-library/examples/#more-examples) contains links to an example that implements vuex. However this example is somewhat outdated: vuex's website says that “Pinia is now the new default”.

The examples folder has no tests referencing Pinia.

The examples should preferably update to reference Pinia.