Improve documentation for examples/widgets/textbox.py#16549

Merged

story645 merged 3 commits intomatplotlib:masterfrom

chrissshe:improve_textbox_example

Feb 21, 2020

Commits on Feb 18, 2020

add more comments. add a reference section
chrissshe
committed

Commits on Feb 19, 2020

Resolve comments on flake8 violations and improve docstrings
chrissshe
committed

Commits on Feb 20, 2020

minor fix to address CI failures
chrissshe
committed