Replace 'positive integer' with 'nonnegative integer' #6583
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This PR replaces all instances of "positive integer" with "nonnegative integer" in the configuration docs, as in every case zero is also an accepted value, and in many cases zero is already singled out in the docs as a possibility.
A "max_width" of zero of course does not give reasonable results (and it results in "left behind trailing whitespace" errors), but a value of 1 is just as bad, so there seems to be no harm in replacing "positive integer" with "nonnegative integer" even in this case.
Fixes #6570.