Improve imageUrl and fileUrl docs

Author: Dimo Dimov

api/javascript/ui/editor.md

@@ -1544,9 +1544,9 @@ The requirements for this handler are the same as for the [save handler](/web/up
 
 ### imageBrowser.transport.imageUrl `String|Function`
 
-The URL responsible for serving the original image. A file name placeholder should be specified.
+The URL responsible for serving the original image. A file name placeholder should be specified. By default the placeholder value is URL encoded. If this is not desired, use a function.
 
-#### Example
+#### Example - imageUrl as String
 
     <textarea id="editor"></textarea>
     <script>
@@ -1559,6 +1559,21 @@ The URL responsible for serving the original image. A file name placeholder shou
     });
     </script>
 
+#### Example - imageUrl as Function (can be used to avoid automatic URL encoding)
+
+    <textarea id="editor"></textarea>
+    <script>
+    $("#editor").kendoEditor({
+      imageBrowser: {
+        transport: {
+          imageUrl: function (e) {
+            return "/content/images/" + e;
+          }
+        }
+      }
+    });
+    </script>
+
 ### imageBrowser.transport.destroy `Object|String`
 
 Options or URL which will handle the file and directory deletion. If not specified the delete button will not be present.
@@ -2337,9 +2352,9 @@ The URL which will handle the upload of the new files. If not specified the Uplo
 
 ### fileBrowser.transport.fileUrl `String|Function`
 
-The URL responsible for serving the original file. A file name placeholder should be specified.
+The URL responsible for serving the original file. A file name placeholder should be specified. By default the placeholder value is URL encoded. If this is not desired, use a function.
 
-#### Example
+#### Example - fileUrl as String
 
     <textarea id="editor"></textarea>
     <script>
@@ -2352,6 +2367,20 @@ The URL responsible for serving the original file. A file name placeholder shoul
     });
     </script>
 
+#### Example - fileUrl as Function (can be used to avoid automatic URL encoding)
+
+    <textarea id="editor"></textarea>
+    <script>
+    $("#editor").kendoEditor({
+      fileBrowser: {
+        transport: {
+          fileUrl: function (e) {
+            return "/content/files/" + e;
+        }
+      }
+    });
+    </script>
+
 ### fileBrowser.transport.destroy `Object|String`
 
 Options or URL which will handle the file and directory deletion. If not specified the delete button will not be present.