[Inventory Management & Dicts Concept] Correct Spelling Errors

[abdelrahman495]

Fixed a typo for better readability.

[github-actions]

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[BethanyG]

Thanks for this PR @abdelrahman495 🙂

In the future, please follow the note and open a post on forum.exercism.org for discussion. It gets more (and quicker) attention that way.

In addition to the exercise introduction.md, the concept about.md needs to be corrected, since it uses the same examples. I will add that to this PR shortly, then test and review.