Update external-kafka.mdx

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

Author: aldy505

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

@@ -63,7 +63,7 @@ If you encounter any failures during installation or startup, try to use `consum
 
 ## Relay
 
-Modify your `relay/config.yml` file like so:
+Modify your `relay/config.yml` file as:
 
 ```yaml
 processing: