Add doc comments for getDeltaLink() method

Author: muthurathinam-m

lib/src/tasks/PageIterator.d.ts

@@ -70,6 +70,10 @@ export declare class PageIterator {
      * @return A promise that resolves to a response data with next page collection
      */
     private fetchAndUpdateNextPageData;
+    /**
+     * Getter to get the deltaLink in the current response
+     * @return A deltaLink which is being used to make delta requests in future
+     */
     getDeltaLink(): string | undefined;
     /**
      * @async

lib/src/tasks/PageIterator.js

@@ -112,6 +112,10 @@ export class PageIterator {
         }
     }
 
+    /**
+     * Getter to get the deltaLink in the current response
+     * @return A deltaLink which is being used to make delta requests in future
+     */
     getDeltaLink(): string | undefined {
         return this.deltaLink;
     }