TextWriter: clarify precisely what warn=None/True/False do #4856
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It took me a while, and some testing, to figure out how to to use
Shape.fill_textbox(warn=...)to NOT write the text when it doesn't fit. The secret sauce waswarn=False, which means "raise an error". I didn't find this very clear until I read the source code.Here's some edits; maybe they help!