Updated doc for twin nesting/key/value increase improvements.

Author: rezasherafat

articles/iot-hub/iot-hub-devguide-device-twins.md

@@ -240,11 +240,11 @@ The [Azure IoT device SDKs](iot-hub-devguide-sdks.md) make it easy to use the pr
 
 Tags, desired properties, and reported properties are JSON objects with the following restrictions:
 
-* All keys in JSON objects are case-sensitive 64 bytes UTF-8 UNICODE strings. Allowed characters exclude UNICODE control characters (segments C0 and C1), and `.`, `$`, and SP.
+* All keys in JSON objects are UTF-8 encoded, case-sensitive, and up-to 1KB in length. Allowed characters exclude UNICODE control characters (segments C0 and C1), and `.`, `$`, and SP.
 
 * All values in JSON objects can be of the following JSON types: boolean, number, string, object. Arrays are not allowed. The maximum value for integers is 4503599627370495 and the minimum value for integers is -4503599627370496.
 
-* All JSON objects in tags, desired, and reported properties can have a maximum depth of 5. For instance, the following object is valid:
+* All JSON objects in tags, desired, and reported properties can have a maximum depth of 10. For instance, the following object is valid:
 
    ```json
    {
@@ -255,7 +255,17 @@ Tags, desired properties, and reported properties are JSON objects with the foll
                    "three": {
                        "four": {
                            "five": {
-                               "property": "value"
+                               "six": {
+                                   "seven": {
+                                       "eight": {
+                                           "nine": {
+                                               "ten": {
+                                                   "property": "value"
+                                               }
+                                           }
+                                       }
+                                   }
+                               }
                            }
                        }
                    }
@@ -266,7 +276,7 @@ Tags, desired properties, and reported properties are JSON objects with the foll
    }
    ```
 
-* All string values can be at most 512 bytes in length.
+* All string values can be at most 4 KB in length.
 
 ## Device twin size
 

includes/iot-hub-limits.md

@@ -35,8 +35,9 @@ The following table lists the limits that apply to IoT Hub resources.
 | Maximum delivery count for feedback messages <br/> in response to a cloud-to-device message |100 |
 | Maximum TTL for feedback messages in <br/> response to a cloud-to-device message |2 days |
 | [Maximum size of device twin](../articles/iot-hub/iot-hub-devguide-device-twins.md#device-twin-size) <br/> (tags, reported properties, and desired properties) | 8 KB |
-| Maximum size of device twin string value | 4 KB |
-| [Maximum depth of object in device twin](../articles/iot-hub/iot-hub-devguide-device-twins.md#tags-and-properties-format) | 5 |
+| Maximum length of device twin string key | 1 KB |
+| Maximum length of device twin string value | 4 KB |
+| [Maximum depth of object in device twin](../articles/iot-hub/iot-hub-devguide-device-twins.md#tags-and-properties-format) | 10 |
 | Maximum size of direct method payload | 128 KB |
 | Job history maximum retention | 30 days |
 | Maximum concurrent jobs | 10 (for S3), 5 for (S2), 1 (for S1) |