Exercises check

[Little Sister's Vocab]: Fixed up Code Examples for `str.join()` & Added an Additional Hint. #4207

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Job	Run time
housekeeping	47s
canonical_sync (3.8)	49s
canonical_sync (3.9)	46s
canonical_sync (3.7)	50s
canonical_sync (3.11.2)	44s
canonical_sync (3.10.6)	49s
	4m 45s