Add spec links

Author: murgatroid99

packages/grpc-js-xds/src/lb-policy-registry.ts

@@ -15,6 +15,8 @@
  *
  */
 
+// https://github.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md
+
 import { LoadBalancingConfig, experimental, logVerbosity } from "@grpc/grpc-js";
 import { LoadBalancingPolicy__Output } from "./generated/envoy/config/cluster/v3/LoadBalancingPolicy";
 import { TypedExtensionConfig__Output } from "./generated/envoy/config/core/v3/TypedExtensionConfig";

packages/grpc-js-xds/src/lb-policy-registry/round-robin.ts

@@ -15,6 +15,8 @@
  *
  */
 
+// https://github.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md
+
 import { LoadBalancingConfig } from "@grpc/grpc-js";
 import { LoadBalancingPolicy__Output } from "../generated/envoy/config/cluster/v3/LoadBalancingPolicy";
 import { TypedExtensionConfig__Output } from "../generated/envoy/config/core/v3/TypedExtensionConfig";

packages/grpc-js-xds/src/lb-policy-registry/typed-struct.ts

@@ -15,6 +15,8 @@
  *
  */
 
+// https://github.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md
+
 import { LoadBalancingConfig, experimental } from "@grpc/grpc-js";
 import { LoadBalancingPolicy__Output } from "../generated/envoy/config/cluster/v3/LoadBalancingPolicy";
 import { TypedExtensionConfig__Output } from "../generated/envoy/config/core/v3/TypedExtensionConfig";

packages/grpc-js-xds/src/load-balancer-xds-wrr-locality.ts

@@ -15,6 +15,8 @@
  *
  */
 
+// https://github.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md
+
 import { LoadBalancingConfig, experimental, logVerbosity } from "@grpc/grpc-js";
 import { loadProtosWithOptionsSync } from "@grpc/proto-loader/build/src/util";
 import { WeightedTargetRaw } from "./load-balancer-weighted-target";