🐛 octavia-cli: fix docker run instruction in README

[alafanechere]

The volume path in the docker run example command is not valid and leads to the following error:

Error response from daemon: create ./my_octavia_project_directory: "./my_octavia_project_directory" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intended to pass a host directory, use absolute path.

I remove ./ + fixed a typo in a workflow heading.