Enhance documentation for getGraphClient and getApp functions in graph.js

src/graph.js

@@ -1,6 +1,15 @@
 import { Client } from "@microsoft/microsoft-graph-client";
 import { loginInteractive } from "./azure.js";
 
+/**
+ * Initialize and return a Microsoft Graph client
+ * along with the authentication token.
+ *
+ * @param { Object } options - Options for authentication
+ * @param { string } options.tenantId - The Azure AD tenant ID
+ * @param { string } options.clientId - The Azure AD client ID
+ * @returns { Object } An object containing the Graph API token and client
+ */
 export async function getGraphClient({ tenantId, clientId }) {
   const graphApiToken = await loginInteractive({
     tenantId,
@@ -17,6 +26,14 @@ export async function getGraphClient({ tenantId, clientId }) {
   return { graphApiToken, client };
 }
 
+
+/**
+ * Get an Azure application by its display name.
+ *
+ * @param { Object } client 
+ * @param { string } appName 
+ * @returns 
+ */
 export async function getApp(client, appName) {
   const result = await client
     .api("/applications")