Cli.py documentation/docstring fixes (#840)
Cli.py documentation/docstring fixes (#840)

* Updating docstring in cli.py

Small wording changes for docstring.

* Adding whitespace to cli.py docstrings

Adding whitespace character to docstrings. Without these, the --help text would not have the correct spacing for some options.

* Moving line of text below to satisfy lint warning

Moving line below to fix linter warning:

./lint.sh
mlflow/cli.py:88:101: E501 line too long (106 > 100 characters)

* Removing trailing whitespace.

mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow