list webhook providers in the same way others

Additionally fixed the ionos webhook url

README.md

@@ -78,7 +78,7 @@ See PR #3063 for all the discussions about it.
 Known providers using webhooks:
 | Provider |  Repo |
 | -------- | ----------- |
-| IONOS | https://github.com/ionos-cloud/external-dns-ionos-plugin | 
+| IONOS | https://github.com/ionos-cloud/external-dns-ionos-webhook | 
 | Adguard Home Provider | https://github.com/muhlba91/external-dns-provider-adguard | 
 | STACKIT | https://github.com/stackitcloud/external-dns-stackit-webhook | 
 | GleSYS | https://github.com/glesys/external-dns-glesys |