update to testing tensorflow gpu

docs/Installation-Windows.md

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-Lastly, you should test to see if everything installed properly.  You can do this to see if TensorFlow can identify your GPU. In an Anaconda Prompt, with the ml-agents Conda environment activated, type in the following command: 
+Lastly, you should test to see if everything installed properly and that TensorFlow can identify your GPU. In the same Anaconda Prompt, type in the following command:
 
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 python