fix(docs): switch to using generic type for useLoaderData

[tomcorey26]

The blog tutorial has you set the typing for useLoaderData by using the type assertion as LoaderData. But typescript shows an error because of the way the hook is typed:

useLoaderData<T = AppData>(): SerializeFrom<T> 

Since the Post model we created in this tutorial contains two fields that are Date (createdAt and updatedAt), typescript complains because it expects the serialized type where they are both string

Conversion of type 'SerializeObject<UndefinedToOptional<LoaderData>>' to type 'LoaderData' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
  The types of 'post.createdAt' are incompatible between these types.
    Type 'string' is not comparable to type 'Date'.ts(2352)

So I updated the docs to pass in the type as a generic instead useLoaderData<LoaderData>().

Also an alternative way to fix the error is to just do the assertion with the SerializeFrom util. e.g

import type { LoaderFunction, SerializeFrom } from "@remix-run/node";

const { post, html } = useLoaderData() as SerializeFrom<LoaderData>;

Not sure if this way would be preferred

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[pcattori]

Superceded by #4684