Add transaction isolation level requirement to database requirements

[fritzmg]

According to magento/magento2#8933 (comment) the https://devdocs.magento.com/guides/v2.3/install-gde/system-requirements-tech.html#database section of the documentation should get the following added:

The transaction isolation level of the MySQL server or session needs to be set to READ-COMITTED (the default is REPEATABLE-READ) in order to avoid deadlock problems with the cron scheduler.

[Kipperlenny]

I don't think this is the solution! Many shared hostings cannot do this, other shopsystems don't need this!

Please fix this in the code - not only mention the bug in the docs...

[shrielenee]

Thank you for your feedback! It doesn't seem like your issue is related to Magento DevDocs documentation. It looks to be a bug in code, which already has an associated open issue.

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