Update slides.html

Fix bioimageio.core CLI use

topics/ai4life/tutorials/contribute-materials/slides.html

@@ -80,11 +80,11 @@
 
 * Static Validation of the model format using the bioimage.core python library
 ```
-python bioimageio validate /../rdf.yaml
+bioimageio validate /../rdf.yaml
 ```
 * Dynamic Validation of the model's deployment
 ```
-python test_model --weights tensorflow_saved_model_bundle --device cpu /.../rdf.yaml
+bioimageio test-model --weights tensorflow_saved_model_bundle --device cpu /.../rdf.yaml
 ```
 
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@@ -161,4 +161,4 @@
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 Remember that you can always read our documentation or additional information on this topic or others in our resources.
 For example, you could check how to get most of your model documentation and considerations for the model description file.
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