be more precise on matrix space and channels

docs/index.md

@@ -23,7 +23,7 @@ You can have a look at the "[Howto Camp 23](https://media.ccc.de/v/eh20-41-howto
 
 ### Public chat powered by matrix
 
-In order to be able to exchange information with other participants in advance, ask questions or look for like-minded people for your project, we offer an event chat based on Matrix. All you need is your own Matrix account. You can find the Camp 2023 space here: [#camp23:events.ccc.de](https://matrix.to/#/#camp2023:events.ccc.de). If you've never used Matrix before, there's some info about it [here](https://chat-info.events.ccc.de).
+In order to be able to exchange information with other participants in advance, ask questions or look for like-minded people for your project, we offer an event chat based on Matrix. All you need is your own Matrix account. You can find the Camp 2023 space containing all camp related channels here: [#camp23:events.ccc.de](https://matrix.to/#/#camp2023:events.ccc.de). If you've never used Matrix before, there's some info about it [here](https://chat-info.events.ccc.de).
 
 ### Contacting the orga