Update docstrings to address #1205

[AnnMarieW]

This PR updates how the docstrings are generated to address #1205

See more details in dash-docs #1063

[alexcjohnson]

As mentioned in plotly/dash-core-components#914 (comment), I think it would be a good idea to escape double quotes in the generated docstrings - even if the added period handles most cases where this would cause problems, the triple-quote potential issue remains.

[chriddyp]

This looks really good! Such a relief to see all of this fixed. Glad we have test cases here with all of the types. Looks like the double quote issue was fixed, any other concerns here @alexcjohnson ?

[alexcjohnson]

Oh, also we need a changelog entry. That and #1531 (comment) then I think this is ready to go!

[alexcjohnson]

@harryturr this PR means the rest of the core will need to be included in the next release whether or not there's a changelog entry for each piece, so all the docstrings get rebuilt.

[alexcjohnson]

💃 Very nice work - big improvement to our docstrings!

[AnnMarieW]

Thanks for your kind words and assistance with this project!