docs(infomaniak): add missing details and guide (#677)

- Precise credentials are dyndns ones, not infomaniak admin ones
- Add official guide link
- Precise to set IPv4 or IPv6 address depending on which IP version you want to use

Author: fuse314

docs/infomaniak.md

@@ -25,8 +25,8 @@
 
 - `"domain"`
 - `"host"` is your host and can be a subdomain or `"@"`
-- `"username"`
-- `"password"`
+- `"username"` for dyndns (**not** your infomaniak admin username!)
+- `"password"` for dyndns (**not** your infomaniak admin password!)
 
 ### Optional parameters
 
@@ -35,3 +35,7 @@
 - `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
 
 ## Domain setup
+
+Follow [this guide](https://www.infomaniak.com/en/support/faq/2357/getting-started-guide-dyndns-with-an-infomaniak-domain) to set up your subdomain including `username` and `password` for use in the configuration. **do not use your infomaniak admin username and password in the configuration!**
+
+If you only plan on using IPv4, add your current IPv4 Address. If you only plan on using IPv6, add your current IPv6 Address. If you plan to use dual-stack (IPv4 and IPv6) addresses, it does not matter what ip-address you put in the dialog.