In Configurations.md demonstrate both cases for noop selections #4986
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Continuing on from discussion in #4948
This PR improves both the idempotentency test and the users comprehension of the documentation.
condense_wildcard_suffixes is an example where this approach is already used.
I'm not sure if the new code added to the noop cases should also be added to the non-noop cases as well. condense_wildcard_suffixes doesnt do that, so I did the same. Let me know if I should change that though.
I havent touched configuration that sorts elements into alphabetical order, as the unsorted elements in the noop case should demonstrate that its not touched by rustfmt just fine.
brace_style: SameLineWhere
doesn't seem to fit its own description , so I just skipped that one...