Update data-formats.md

Author: magrefaat

articles/cognitive-services/language-service/custom-classification/concepts/data-formats.md

@@ -34,7 +34,7 @@ Your tags file should be in the `json` format below.
     ],
     "documents": [
         {
-            "location": "doc1.txt",
+            "location": "file1.txt",
             "language": "en-us",
             "classifiers": [
                 {
@@ -44,6 +44,15 @@ Your tags file should be in the `json` format below.
                     "classifierName": "Class1"
                 }
             ]
+        },
+        {
+            "location": "file2.txt",
+            "language": "en-us",
+            "classifiers": [
+                {
+                    "classifierName": "Class2"
+                }
+            ]
         }
     ]
 }
@@ -55,7 +64,7 @@ Your tags file should be in the `json` format below.
 * `documents`: An array of tagged documents. For example:
   * `location`: The path of the JSON file containing tags. The tags file has to be in root of the storage container.
   * `language`: Language of the document. Use one of the [supported culture locales](../language-support.md).
-  * `classifiers`: Array of classifier objects assigned to the document. If you're working on a single classification project, there should be one classifier only.
+  * `classifiers`: Array of classifier objects assigned to the document. If you're working on a single classification project, there should be one classifier per file only.
 
 ## Next steps