jupyter label change 2.2rc0 to 2.2

Author: hephaex

python-tensorflow/Dockerfile.2.2-py36-cuda10.1

@@ -73,7 +73,7 @@ RUN python3 -m pip install --no-cache-dir \
 	    nni
 
 # Install ipython kernelspec
-Run python3 -m ipykernel install --display-name "TensorFlow 2.2rc0 on Python 3.6 (CUDA 10.1)" && \
+Run python3 -m ipykernel install --display-name "TensorFlow 2.2 on Python 3.6 (CUDA 10.1)" && \
     cat /usr/local/share/jupyter/kernels/python3/kernel.json
 
 # Jupyter notebook extension