fixes duplicate "in this guide"

docs/Installation-Windows.md

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-Copy these three folders into the CUDA toolkit directory.  In this guide, the CUDA toolkit directory is located at `C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.1`
+Copy these three folders into the CUDA toolkit directory.  The CUDA toolkit directory is located at `C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.1`
 
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