Exercises check

[Little Sister's Vocab]: Fixed up Code Examples for `str.join()` & Added an Additional Hint. #4206

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Job	Run time
housekeeping	54s
canonical_sync (3.8)	46s
canonical_sync (3.10.6)	49s
canonical_sync (3.7)	46s
canonical_sync (3.11.2)	45s
canonical_sync (3.9)	43s
	4m 43s