`StarWarsSchema` type descriptions are `null` in Introspection docs

We're currently specifying descriptions in the `StarWarsSchema` using comments:

https://github.com/graphql/graphql.github.io/blob/51db38b9c3c32b7c0cb50640853ecace27aabc68/src/components/Marked/swapiSchema.tsx#L112-L113

...which is causing them to resolve as `null` when we run introspection queries, like in this example on the Introspection docs page:

>

The [newer versions of the spec](https://spec.graphql.org/October2021/#sec-Descriptions) outline that descriptions should use a `BlockString` like this:

```
"""
An autonomous mechanical character in the Star Wars universe
"""
type Droid implements Character {}
```

Here's with a `BlockString` description for `Droid` instead:

>

Looks like, alternatively, we could specify `commentDescriptions` in our invocation of `makeExecutableSchema`, but we might as well make our schema consistent with the current way of specifying descriptions in the spec.

I can open a PR for this change if it sounds good.

Start in src/components/Marked/swapiSchema.tsx, especially the description comments around lines 112–113, and compare them with the GraphQL specification's BlockString example. Check the Introspection docs page to reproduce the null descriptions. Done means the StarWarsSchema descriptions appear in introspection results instead of null.

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