Register namespace for sample serviceBot in registration.sample.yml (#643)

* Update service_bots.md

* Update registration.sample.yml

* Create 643.doc

changelog.d/643.doc

@@ -0,0 +1 @@
+Update docs and sample config for serviceBots. Thanks to @HarHarLinks.

docs/advanced/service_bots.md

@@ -26,3 +26,11 @@ serviceBots:
 ```
 
 There will be a bot user `@feeds:example.com` which responds to commands prefixed with `!feeds`, and only handles feeds connections.
+
+For the homeserver to allow hookshot control over users, they need to be added to the list of user namespaces in the `registration.yml` file provided to the homeserver.
+
+In the example above, you would need to add these lines:
+```yaml
+    - regex: "@feeds:example.com" # Where example.com is your homeserver's domain
+      exclusive: true
+```

registration.sample.yml

@@ -12,6 +12,8 @@ namespaces:
       exclusive: true
     - regex: "@_webhooks_.*:foobar" # Where _webhooks_ is set by userIdPrefix in config.yml
       exclusive: true
+    - regex: "@feeds:foobar" # Matches the localpart of all serviceBots in config.yml
+      exclusive: true
   aliases:
     - regex: "#github_.+:foobar" # Where foobar is your homeserver's domain
       exclusive: true