Use constuctors for creating docs2 and 3's models

Author: LarryKlugerDS

lib/examples/eg002SigningViaEmail.js

@@ -182,8 +182,6 @@ function makeEnvelope(args){
 
     // add the documents
     let doc1 = new docusign.Document()
-      , doc2 = new docusign.Document()
-      , doc3 = new docusign.Document()
       , doc1b64 = Buffer.from(document1(args)).toString('base64')
       , doc2b64 = Buffer.from(doc2DocxBytes).toString('base64')
       , doc3b64 = Buffer.from(doc3PdfBytes).toString('base64')
@@ -193,20 +191,25 @@ function makeEnvelope(args){
     doc1.name = 'Order acknowledgement'; // can be different from actual file name
     doc1.fileExtension = 'html'; // Source data format. Signed docs are always pdf.
     doc1.documentId = '1'; // a label used to reference the doc
-    doc2.documentBase64 = doc2b64;
-    doc2.name = 'Battle Plan'; // can be different from actual file name
-    doc2.fileExtension = 'docx';
-    doc2.documentId = '2';
-    doc3.documentBase64 = doc3b64;
-    doc3.name = 'Lorem Ipsum'; // can be different from actual file name
-    doc3.fileExtension = 'pdf';
-    doc3.documentId = '3';
+    
+    // Alternate pattern: using constructors for docs 2 and 3...
+    let doc2 = new docusign.Document.constructFromObject({
+            documentBase64: doc2b64,
+            name: 'Battle Plan', // can be different from actual file name
+            fileExtension: 'docx',
+            documentId: '2'});
+        
+    let doc3 = new docusign.Document.constructFromObject({
+            documentBase64: doc3b64,
+            name: 'Lorem Ipsum', // can be different from actual file name
+            fileExtension: 'pdf',
+            documentId: '3'});
 
     // The order in the docs array determines the order in the envelope
     env.documents = [doc1, doc2, doc3];
 
     // create a signer recipient to sign the document, identified by name and email
-    // We're setting the parameters via the object creation
+    // We're setting the parameters via the object constructor
     let signer1 = docusign.Signer.constructFromObject({
         email: args.signerEmail,
         name: args.signerName,