chore: add comments about what the data structures mean

Author: trivikr

src/transforms/v2-to-v3/config/CLIENT_NAMES.ts

@@ -1,3 +1,4 @@
+// The client names as they appear in v2.
 export const CLIENT_NAMES = [
   "ACM",
   "ACMPCA",

src/transforms/v2-to-v3/config/CLIENT_NAMES_MAP.ts

@@ -1,5 +1,6 @@
 import { CLIENT_NAMES } from "./CLIENT_NAMES";
 
+// The key is the client name in v2, and value is the client name in v3.
 export const CLIENT_NAMES_MAP: Record<string, string> = {
   ...CLIENT_NAMES.reduce((acc, name) => ({ ...acc, [name]: name }), {}),
   AugmentedAIRuntime: "SageMakerA2IRuntime",

src/transforms/v2-to-v3/config/CLIENT_PACKAGE_NAMES_MAP.ts

@@ -1,5 +1,6 @@
 import { CLIENT_NAMES } from "./CLIENT_NAMES";
 
+// The key is the client name in v2, and value is the client package name in v3.
 export const CLIENT_PACKAGE_NAMES_MAP: Record<string, string> = {
   ...CLIENT_NAMES.reduce(
     (acc, name) => ({