Update external-kafka.mdx

Co-authored-by: Burak Yigit Kaya <[email protected]>

Author: aldy505

develop-docs/self-hosted/experimental/external-kafka.mdx

@@ -81,7 +81,7 @@ processing:
 
 ## Vroom
 
-As of the time of writing, Vroom does not support any kind of authentication.
+At the time of writing, Vroom does not support any kind of authentication.
 
 Modify your `docker-compose.yml` file like so: