attempted to improve wording

[senarclens]

started by fixing a typo (exiting -> exciting) but then tried to reduce
the length of some sentences; added hints that references are expected
where appropriate to allow the reader to focus on the problem at hand

[github-actions]

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[senarclens]

Opened a discussion at https://forum.exercism.org/t/attempted-to-improve-wording/16439

[vaeng]

Thanks for the improvements!