Update tensorflow_mnist.md images:

* Example saves 5 model checkpoints so that image looks different
* docs refers to monitor metrics so image includes those

docs/guides/frameworks/tensorflow/tensorflow_mnist.md

@@ -13,30 +13,35 @@ When the script runs, it creates a task named `Tensorflow v2 mnist with summarie
 The loss and accuracy metric scalar plots appear in the task's page in the **ClearML web UI** under 
 **SCALARS**. Resource utilization plots, which are titled **:monitor: machine**, also appear in the **SCALARS** tab.
 
-![Task scalars](../../../img/examples_tensorflow_mnist_06.png)
+![Task scalars](../../../img/examples_tensorflow_mnist_06.png#light-mode-only)
+![Task scalars](../../../img/examples_tensorflow_mnist_06_dark.png#dark-mode-only)
 
 ## Hyperparameters
 
 ClearML automatically logs TensorFlow Definitions. They appear in **CONFIGURATION** **>** **HYPERPARAMETERS** 
 **>** **TF_DEFINE**.
 
-![Task hyperparameters](../../../img/examples_tensorflow_mnist_01.png)
+![Task hyperparameters](../../../img/examples_tensorflow_mnist_01.png#light-mode-only)
+![Task hyperparameters](../../../img/examples_tensorflow_mnist_01_dark.png#dark-mode-only)
 
 ## Console
 
 All console output appears in **CONSOLE**.
 
-![Task console](../../../img/examples_tensorflow_mnist_05.png)
+![Task console](../../../img/examples_tensorflow_mnist_05.png#light-mode-only)
+![Task console](../../../img/examples_tensorflow_mnist_05_dark.png#dark-mode-only)
 
 ## Artifacts
 
 Models created by the task appear in the task's **ARTIFACTS** tab. ClearML automatically logs and tracks 
 models and any snapshots created using TensorFlow. 
 
-![Task models](../../../img/examples_tensorflow_mnist_03.png)
+![Task models](../../../img/examples_tensorflow_mnist_03.png#light-mode-only)
+![Task models](../../../img/examples_tensorflow_mnist_03_dark.png#dark-mode-only)
 
 Clicking on a model's name takes you to the [model's page](../../../webapp/webapp_model_viewing.md), where you can 
 view the model's details and access the model.
 
 
-![Model details](../../../img/examples_tensorflow_mnist_10.png)
+![Model details](../../../img/examples_tensorflow_mnist_10.png#light-mode-only)
+![Model details](../../../img/examples_tensorflow_mnist_10_dark.png#dark-mode-only)