"Proxy" is a loaded term in the docs. Should be named `Remote` when referring to symbol methods

> Every proxy created by Comlink has the `[releaseProxy]()` method. Calling it will detach the proxy and the exposed object from the message channel, allowing both ends to be garbage collected.

However this isn't true. This won't work:
```ts
import { proxy, releaseProxy } from "comlink";

const proxied = proxy({});
proxy[releaseProxy]();
```

One would think that the return type of a `proxy` function would count as a proxy, but it's not.

Only `Remote` types have the `ProxyMethods` on them:
https://github.com/GoogleChromeLabs/comlink/blob/main/src/comlink.ts#LL138C8-L138C8

The docs should maybe say that every `Remote` created by a `wrap` has a `[releaseProxy]()` method.