Update video OLX docs

Description

says the mallow team had made some changes to video OLX, that retrospectively, we should have called out in our hawthorne docs. The team has drafted some documentation, explaining the changes and impacts: https://openedx.atlassian.net/wiki/spaces/EDUCATOR/pages/815366180/Content-store+Deprecation+Summary

The primary doc need is for an addition to the Hawthorn release notes: https://edx.readthedocs.io/projects/open-edx-release-notes/en/latest/hawthorn.html#deprecated-features

This probably also goes in https://edx.readthedocs.io/projects/edx-open-learning-xml/en/latest/components/video-components.html

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Assignee

Grant Goodman

Reporter

Grant Goodman

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