📝 Fix PAYLOAD.md regarding "drawable" directory name (#1711)

docs/PAYLOAD.md

@@ -233,7 +233,8 @@ var push = PushNotification.init({
 });
 ```
 
-Where *icon* is the name of an image in the Android *drawables* folder. Writing a hook to describe how to copy an image to the Android *drawables* folder is out of scope for this README but there is an [excellent tutorial](http://devgirl.org/2013/11/12/three-hooks-your-cordovaphonegap-project-needs/) that you can copy.
+Where *icon* is the name of an `.png` image file in the Android `res/drawable` folder. For example: `platforms/android/res/drawable/phonegap.png`
+Writing a hook to describe how to copy an image to the Android `res/drawable` folder is out of scope for this README but there is an [excellent tutorial](http://devgirl.org/2013/11/12/three-hooks-your-cordovaphonegap-project-needs/) that you dcan copydd
 
 *iconColor* is one of the supported formats #RRGGBB or #AARRGGBB or one of the following names: 'red', 'blue', 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow', 'lightgray', 'darkgray', 'grey', 'lightgrey', 'darkgrey', 'aqua', 'fuchsia', 'lime', 'maroon', 'navy', 'olive', 'purple', 'silver', 'teal'. *iconColor* is supported on Android 5.0 and greater.
 
@@ -243,14 +244,14 @@ Please follow the [Android icon design guidelines](https://www.google.com/design
 
 Additionally, each push can include a large icon which is used to personalize each push. The location of the image may one of three types.
 
-The first is the *drawables* folder in your app. This JSON sent from GCM:
+The first is the `res/drawable` folder in your app. This JSON sent from GCM:
 
 ```javascript
 {
     "registration_ids": ["my device id"],
     "data": {
         "title": "Large Icon",
-    	"message": "Loaded from drawables folder",
+    	"message": "Loaded from drawable folder",
     	"image": "twitter"
     }
 }
@@ -266,15 +267,15 @@ var deviceID = "my device id";
 var service = new gcm.Sender(apiKey);
 var message = new gcm.Message();
 message.addData('title', 'Large Icon');
-message.addData('message', 'Loaded from drawables folder.');
+message.addData('message', 'Loaded from drawable folder.');
 message.addData('image', 'twitter');
 service.send(message, { registrationTokens: [ deviceID ] }, function (err, response) {
 	if(err) console.error(err);
 	else 	console.log(response);
 });
 ```
 
-Would look for the *twitter* image in the drawables folder and produce the following notification.
+Would look for the *twitter* image in the `res/drawable` folder and produce the following notification.
 
 ![2015-07-24 02 34 41](https://cloud.githubusercontent.com/assets/353180/8866903/2df48028-3190-11e5-8176-fe8b3f7c5aab.png)
 
@@ -309,7 +310,7 @@ service.send(message, { registrationTokens: [ deviceID ] }, function (err, respo
 });
 ```
 
-Would look for the *logo.png* file in the assets/www/img folder. Since your apps www folder gets copied into the Android assets folder it is an excellent spot to store the images without needing to write a hook to copy them to the *drawables* folder. It produces the following notification.
+Would look for the *logo.png* file in the assets/www/img folder. Since your apps www folder gets copied into the Android assets folder it is an excellent spot to store the images without needing to write a hook to copy them to the `res/drawable` folder. It produces the following notification.
 
 ![2015-07-24 02 20 02](https://cloud.githubusercontent.com/assets/353180/8866901/2df19052-3190-11e5-8c16-a355c59209f3.png)