Reformat long lines in tutorial examples. #818
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While most examples in the tutorial are carefully formatted to avoid the need for horizontal scroll bars, there are a few long lines. This PR reformats those long lines in examples to approximately 70-72 characters, which I believe brings them in line with the rest of the examples. I have tried to exercise sound judgement to maximize readability rather than applying the rule rigidly, and I have tried to maintain the original author's intent as carefully as possible. For instance, I have not tried to reword comments for brevity.
In my testing, all affected examples now render without horizontal scroll bars on a wide desktop layout.
All tests that passed previously still pass for me. (6 doc-tests failed for me before I made any changes, but that's a separate concern.)
Example
Before:
After: