[Docs]: Incorrect param name in loader example under "1. Create a Router" section

[Willvillegas]

Describe what's incorrect/missing in the documentation

In the file react-router/docs/start/data/custom.md, under the section titled ### 1. Create a Router, there's an example that defines a route with the path "shows/:showId". However, inside the loader function, the code incorrectly uses params.id instead of params.showId.

Current code:

loader: ({ request, params }) =>
  fetch(`/api/show/${params.id}.json`, {
    signal: request.signal,
  }),

Correct code:

loader: ({ request, params }) =>
  fetch(`/api/show/${params.showId}.json`, {
    signal: request.signal,
  }),

The dynamic segment in the path is :showId, so params.showId should be used to retrieve its value. params.id would be undefined in this case.

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