Image updates, some text

Author: w-azure

articles/iot-edge/how-to-vs-code-develop-module.md

@@ -72,7 +72,7 @@ To build and deploy your module image, you need Docker to build the module image
 
 ::: zone pivot="iotedge-dev-cli"
 
-- Install the Python-based [Azure IoT Edge Dev Tool](https://pypi.org/project/iotedgedev/) in order to set up your local development environment to debug, run, and test your IoT Edge solution. If you haven't already done so, install [Python (3.6/3.7) and Pip3](https://www.python.org/) and then install the IoT Edge Dev Tool (iotedgedev) by running the following command in your terminal. 
+- Install the Python-based [Azure IoT Edge Dev Tool](https://pypi.org/project/iotedgedev/) in order to set up your local development environment to debug, run, and test your IoT Edge solution. If you haven't already, install [Python (3.6/3.7)](https://www.python.org/downloads/) and Pip3 and then install the IoT Edge Dev Tool (iotedgedev) with the following command in your terminal. 
 
     ```cmd
     pip3 install iotedgedev

articles/iot-edge/iot-edge-certs.md

@@ -43,7 +43,7 @@ These core scenarios are where IoT Edge uses certificates. Use the links to lear
 
 To help understand IoT Edge certificate concepts, imagine a scenario where an IoT Edge device named *EdgeGateway* connects to an Azure IoT Hub named *ContosoIotHub*. In this example, all authentication is done with X.509 certificate authentication rather than symmetric keys. To establish trust in this scenario, we need to guarantee the IoT Hub and IoT Edge device are authentic:  *"Is this device genuine and valid?"* and *"Is the identity of the IoT Hub correct?"*. The scenario can be illustrated as follows:
 
-:::image type="content" source="./media/iot-edge-certs/trust-scenario.svg" alt-text="Trust scenario state diagram showing connection between IoT Edge device and IoT Hub." lightbox="./media/iot-edge-certs/trust-scenario.svg":::
+:::image type="content" source="./media/iot-edge-certs/trust-scenario.png" alt-text="Trust scenario state diagram showing connection between IoT Edge device and IoT Hub." lightbox="./media/iot-edge-certs/trust-scenario.png":::
 
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@@ -150,7 +150,7 @@ If we view the thumbprint value for the *EdgeGateway* device in the Azure portal
 
 In summary, *ContosoIotHub* can trust *EdgeGateway* because *EdgeGateway* presents a valid **IoT Edge device identity certificate** whose thumbprint matches the one registered in IoT Hub. 
 
-For more information about the certificate process, see [Create and provision an IoT Edge device on Linux using X.509 certificates](how-to-provision-single-device-linux-x509.md).
+For more information about the certificate building process, see [Create and provision an IoT Edge device on Linux using X.509 certificates](how-to-provision-single-device-linux-x509.md).
 
 > [!NOTE]
 > This example doesn't address Azure IoT Hub Device Provisioning Service (DPS), which has support for X.509 CA authentication with IoT Edge when provisioned with an enrollment group. Using DPS, you upload the CA certificate or an intermediate certificate, the certificate chain is verified, then the device is provisioned. To learn more, see [DPS X.509 certificate attestation](../iot-dps/concepts-x509-attestation.md).
@@ -171,7 +171,7 @@ You now have a good understanding of a simple interaction IoT Edge between and I
 
 We add a regular IoT device named *TempSensor*, which connects to its parent IoT Edge device *EdgeGateway* that connects to IoT Hub *ContosoIotHub*. Similar to before, all authentication is done with X.509 certificate authentication. Our new scenario raises two new questions: *"Is the TempSensor device legitimate?"* and *"Is the identity of the EdgeGateway correct?"*. The scenario can be illustrated as follows:
 
-:::image type="content" source="./media/iot-edge-certs/trust-scenario-ext.svg" alt-text="Trust scenario state diagram showing connection between IoT Edge device, an IoT Edge gateway, and IoT Hub." lightbox="./media/iot-edge-certs/trust-scenario-ext.svg":::
+:::image type="content" source="./media/iot-edge-certs/trust-scenario-ext.png" alt-text="Trust scenario state diagram showing connection between IoT Edge device, an IoT Edge gateway, and IoT Hub." lightbox="./media/iot-edge-certs/trust-scenario-ext.png":::
 
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 stateDiagram-v2