Exercises check

Fix minor inconsistencies in introduction.md of guidos-gorgeous-lasagna #4290

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Job	Run time
housekeeping	48s
canonical_sync (3.8)	49s
canonical_sync (3.7)	49s
canonical_sync (3.10.6)	41s
canonical_sync (3.11.2)	50s
canonical_sync (3.9)	48s
	4m 45s