Update README.md for modular OTA information

Author: chinglee-iot

README.md

@@ -36,7 +36,7 @@ git submodule update --init --recursive
 
 This repository currently supports 3 demos implemented as FreeRTOS [tasks](https://www.freertos.org/taskandcr.html), each of which utilize the same MQTT connection. The demos use the [coreMQTT](https://www.freertos.org/mqtt/index.html) library, while the [coreMQTT-Agent](https://www.freertos.org/mqtt-agent/index.html) library is employed to manage thread safety for the MQTT connection. The demos are the following:
 
-* **ota_over_mqtt_demo**: This demo uses the [AWS IoT OTA service](https://docs.aws.amazon.com/freertos/latest/userguide/freertos-ota-dev.html) for FreeRTOS to configure and create OTA updates. The OTA client software on the ESP32-C3 uses the [AWS IoT OTA library](https://www.freertos.org/ota/index.html) and runs in the background within a FreeRTOS agent (or daemon) task. A new firmware image is first signed and uploaded to the OTA service, and the project is then configured to store the corresponding public key certificate. The demo subscribes to, and listens on, an OTA job topic in order to be notified of an OTA update. Upon receiving notification of a pending OTA update, the device downloads the firmware patch and performs code signature verification of the downloaded image by using the public key certificate. On successful verification, the device reboots and the updated image is activated. The OTA client then performs a self-test on the updated image to check for its integrity.
+* **ota_over_mqtt_demo**: This demo uses the [AWS IoT OTA service](https://docs.aws.amazon.com/freertos/latest/userguide/freertos-ota-dev.html) for FreeRTOS to configure and create OTA updates. The OTA client software on the ESP32-C3 follows the [Modular Over the Air Updates](https://freertos.org/freertos-core/over-the-air-updates/index.html) design and runs in the background within a FreeRTOS agent (or daemon) task. A new firmware image is first signed and uploaded to the OTA service, and the project is then configured to store the corresponding public key certificate. The demo subscribes to, and listens on, an OTA job topic in order to be notified of an OTA update. Upon receiving notification of a pending OTA update, the device downloads the firmware patch and performs code signature verification of the downloaded image by using the public key certificate. On successful verification, the device reboots and the updated image is activated. The OTA client then performs a self-test on the updated image to check for its integrity.
 * **sub_pub_unsub_demo**: The demo creates tasks which subscribe to a topic on AWS IoT Core, publish a constant string to the same topic, receive their publish (since they are subscribed to the topic they publish to), and then unsubscribe from the topic in a loop.
 * **temp_sub_pub_and_led_control_demo**: This demo creates a task which subscribes to a topic on AWS IoT Core. This task then reads the temperature from the onboard temperature sensor, publishes this information in JSON format to the same topic, and then receives this publish (since it is subscribed to the same topic it just published to) in a loop. This demo also enables a user to send a JSON packet back to the device to turn an LED off or on.