Exercises check

Touch ups and edits for clarity in instructions, introductions, hints… #3956

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Run time

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Job	Run time
housekeeping	48s
canonical_sync (3.7)	37s
canonical_sync (3.8)	39s
canonical_sync (3.9)	36s
canonical_sync (3.10.6)	48s
canonical_sync (3.11.2)	43s
	4m 11s