fixed type of kernel name

Author: hephaex

python-tensorflow/Dockerfile.2.4-py38-cuda11.1

@@ -85,7 +85,7 @@ RUN python3 -m pip install --no-cache-dir \
 
 COPY ./service-defs /etc/backend.ai/service-defs
 # Install ipython kernelspec
-Run python3 -m ipykernel install --display-name "TensorFlow 2.4 on Python 3.8 & CUDA 11ᇂᇂᇂᇂ.1" && \
+Run python3 -m ipykernel install --display-name "TensorFlow 2.4 on Python 3.8 & CUDA 11.1" && \
     cat /usr/local/share/jupyter/kernels/python3/kernel.json
 
 # Backend.AI specifics