Fix one line docstrings https://www.python.org/dev/peps/pep-0257/#one-line-docstrings  One line docstrings should fit on one line and end with a period
Fix one line docstrings https://www.python.org/dev/peps/pep-0257/#one-line-docstrings  One line docstrings should fit on one line and end with a period

plotly/dash,plotly/dash,plotly/dash,plotly/dash,plotly/dash