Adjust docs on same-server recipients

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*This API is available since Fedify 0.9.0.*

In most cases, you will not want to deliver activities via ActivityPub to

recipients on the same server with the sender.  To exclude same-server

recipients, you can pass the `excludeBaseUris` option to the

`~Context.sendActivity()` method:

Usually, you don't want to send messages through ActivityPub to followers on

the same server because they share the same database, so there's no need to.

For example, if *@foo@example.com* creates a post, it's already stored in

the database at *example.com*, so there's no need to send a `Create(Note)`

activity to *@bar@example.com*, because *@bar@example.com* already has access

to the post in the database.

To exclude same-server recipients, you can pass the `excludeBaseUris` option

to the `~Context.sendActivity()` method:

~~~~ typescript twoslash

import { Activity, type Context } from "@fedify/fedify";