Adds reference to envoy slow start documentation

Author: anuragagarwal561994

A100-client-side-weighted-round-robin-slow-start.md

@@ -10,7 +10,7 @@ A100: Client-side weighted round robin slow start configuration
 
 This proposal introduces an enhancement to the existing client-side weighted_round_robin (WRR) load balancing policy in gRPC by incorporating a configurable `slow_start_config` mechanism. The intent of this feature is to gradually increase traffic to backend endpoints that are newly introduced or have recently rejoined the cluster, allowing them time to warm up and reach their optimal performance level before handling their full share of traffic. This change increases system stability and resilience in environments with dynamic scaling and volatile workloads.
 
-The design borrows from production-ready practices in other load balancers such as Envoy, where gradual traffic ramp-up (slow start) is a well-established technique for avoiding performance degradation and request failures during backend startup or recovery. The slow start feature gradually increases the traffic sent to newly added endpoints during a warmup period, allowing them to warm up their caches and establish connections before receiving full traffic load.
+The design borrows from production-ready practices in other load balancers such as Envoy, where gradual traffic ramp-up (slow start) is a [well-established technique](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/upstream/load_balancing/slow_start) for avoiding performance degradation and request failures during backend startup or recovery. The slow start feature gradually increases the traffic sent to newly added endpoints during a warmup period, allowing them to warm up their caches and establish connections before receiving full traffic load.
 
 ## Background