Remove redundant "either"

Co-authored-by: Alan Dooley <ADubhlaoich@users.noreply.github.com>

Author: 2 people

docs/developer/design-principles.md

@@ -1,7 +1,7 @@
 # Design Principles
 
 The aim of the NGINX Kubernetes Gateway is to become a fundamental infrastructure component within a Kubernetes cluster,
-serving as both an ingress and egress point for traffic directed towards the services (applications) running either
+serving as both an ingress and egress point for traffic directed towards the services (applications) running
 within or outside the cluster. Leveraging NGINX as a data plane technology, it harnesses the well-established reputation
 of NGINX as an open-source project widely recognized for its role as a web server, proxy, load balancer, and content
 cache. NGINX is renowned for its stability, high performance, security, and rich feature set, positioning it as a