fix: slides_create_image URL (googleworkspace#127)

* fix: slides_create_image URL

* docs: Update slides_create_image comment

* refactor: Standardize comment and revert var uppercase

* Update Snippets.gs

Author: grant

slides/api/Snippets.gs

@@ -119,14 +119,12 @@ Snippets.prototype.createTextboxWithText = function(presentationId, pageId) {
 };
 
 Snippets.prototype.createImage = function(presentationId, pageId) {
-  var imageFileId = '0B2P_aO_vjnJ4aERnX2ZzbUtMZXc';
   // [START slides_create_image]
-  // Add a new image to the presentation page. The image is assumed to exist in
-  // the user's Drive, and have 'imageFileId' as its file ID.
+  // Create a new image, using the supplied object ID, with content downloaded from imageUrl.
   var requests = [];
   var imageId = 'MyImage_01';
-  var imageUrl = DriveApp.getFileById(imageFileId).getDownloadUrl() + '&access_token=' +
-      ScriptApp.getOAuthToken();
+  var imageUrl = 'https://www.google.com/images/branding/googlelogo/2x/' +
+      'googlelogo_color_272x92dp.png';
   var emu4M = {
     magnitude: 4000000,
     unit: 'EMU'