Errors in the Installation guide

[0nhc]

I was following the installation guide to install the system.
However I found It fails to execute

./scripts/docker_install.sh

This is because the original file name of 'docker_install.sh' has a blanck between 'docker' and '_install', which is 'docker _install.sh'.
I have already renamed the file in commit 1150eba, you can simply merge this pull to fix it.

[0nhc]

Sorry for pulling two commits in one pull... I mistakenly pushed another commit to my forked repo... But if you don't mind, you can also review another problem I want to report:
When I was executing

# test
sudo docker run --rm --gpus all nvidia/cuda:11.0-base nvidia-smi

The command line returns errors as:

Unable to find image 'nvidia/cuda:11.0-base' locally
docker: Error response from daemon: manifest for nvidia/cuda:11.0-base not found: manifest unknown: manifest unknown.
See 'docker run --help'.

So I opened DockerHub and checked tags of nvidia/cuda.
I found there is no tag as 'nvidia/cuda:11.0-base', instead there is 'nvidia/cuda:11.0.3-base-ubuntu20.04'.
I have already changed the tag and the test passed.
You can check the second commit 4a6d023.