Rollup merge of #127363 - GuillaumeGomez:improve-fmt-code-readability, r=Amanieu

Improve readability of some fmt code examples

Some indent was weird. Some examples were too long (overall better to keep it to maximum 80 columns, but only changed the most outstanding ones).

r? ```@Amanieu```
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Michael Goulet 2024-07-05 20:49:33 -04:00 committed by GitHub
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