Mistake in the linking docs

[michaelpomogajko]

In the section Serializing and parsing params the example tries to achieve the following state

const state = {
  routes: [
    {
      name: 'Chat',
      params: { at: 1589842744264 },
    },
  ];
}

with the param named at. But the path to it being chat/:date.

Meaning the resulting route param would be

params: {date: 1589842744264}

This needs fixing, and also I'm missing an option in renaming the state params from the path params. As in this example we want to map chat/:date to at param.