Update docs and sample config for the relay_api (#3011)

This adds an empty `relay_api` section to the sample configuration. For
SQLite environments, or others where a `database.connection_string` is
needed for each section, there should be an entry in the configuration
sample as a basis.

This PR also changes the "Configuring Dendrite" documentation in that
respect.

The requirement was introduced in #2917. When upgrading dendrite, it
will complain about `relay_api.database.connection_string` not being
configured.

### Pull Request Checklist

<!-- Please read
https://matrix-org.github.io/dendrite/development/contributing before
submitting your pull request -->

* [x] I have added Go unit tests or [Complement integration
tests](https://github.com/matrix-org/complement) for this PR _or_ I have
justified why this PR doesn't need tests
* [x] Pull request includes a [sign off below using a legally
identifiable
name](https://matrix-org.github.io/dendrite/development/contributing#sign-off)
_or_ I have already signed off privately

Signed-off-by: `Alex Kirk <akirk@users.noreply.github.com>`
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@ -10,7 +10,7 @@ permalink: /installation/configuration
A YAML configuration file is used to configure Dendrite. A sample configuration file is
present in the top level of the Dendrite repository:
* [`dendrite-sample.monolith.yaml`](https://github.com/matrix-org/dendrite/blob/main/dendrite-sample.monolith.yaml)
* [`dendrite-sample.yaml`](https://github.com/matrix-org/dendrite/blob/main/dendrite-sample.yaml)
You will need to duplicate the sample, calling it `dendrite.yaml` for example, and then
tailor it to your installation. At a minimum, you will need to populate the following
@ -86,9 +86,8 @@ that you chose.
### Global connection pool
If you are running a monolith deployment and want to use a single connection pool to a
single PostgreSQL database, then you must uncomment and configure the `database` section
within the `global` section:
If you want to use a single connection pool to a single PostgreSQL database, then you must
uncomment and configure the `database` section within the `global` section:
```yaml
global:
@ -102,15 +101,15 @@ global:
**You must then remove or comment out** the `database` sections from other areas of the
configuration file, e.g. under the `app_service_api`, `federation_api`, `key_server`,
`media_api`, `mscs`, `room_server`, `sync_api` and `user_api` blocks, otherwise these will
override the `global` database configuration.
`media_api`, `mscs`, `relay_api`, `room_server`, `sync_api` and `user_api` blocks, otherwise
these will override the `global` database configuration.
### Per-component connections (all other configurations)
If you are are using SQLite databases or separate PostgreSQL
databases per component, then you must instead configure the `database` sections under each
of the component blocks ,e.g. under the `app_service_api`, `federation_api`, `key_server`,
`media_api`, `mscs`, `room_server`, `sync_api` and `user_api` blocks.
`media_api`, `mscs`, `relay_api`, `room_server`, `sync_api` and `user_api` blocks.
For example, with PostgreSQL: