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PR Summary
Fixes a formatting issue with the heading. Original rendered docs:
Cause:
Having a file-level """-docstring immediately followed by a sphinx-gallery comment section is problematic. Each part is stripped when generating the .rst file. In the present case, this results in no blank line before the heading (https://matplotlib.org/devdocs/_sources/gallery/lines_bars_and_markers/joinstyle.rst.txt), which is invalid ReST markup.
Note: Also changed the heading marker to not conflict with triple-quotes.