remove typos from docstring and export Docstrings as documentation

Documentation/src/covariance.html

Documentation/src/index.html

Documentation/src/input_arguments.html

Documentation/src/io.html

src/__main__.py

src/__pycache__/covariance.cpython-38.pyc

src/__pycache__/input_arguments.cpython-38.pyc

src/__pycache__/io.cpython-38.pyc

src/covariance.py

src/input_arguments.py

src/io.py