FC-0068 docs: concept and how-tos cleaning by edunext 13

[Apgomeznext]

This PR modifies some how-tos and concept documents migrated from the legacy repositories to the educators' documentation.

[openedx-webhooks]

Thanks for the pull request, @Apgomeznext!

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[jswope00]

tiny change requested

[jswope00]

Typo "promblem" should be "problem"

[Apgomeznext]

Solved! Thank you!