Update the woo seo documentation to make sure we mention the change in schema behavior.

[thijsoo]

We changed the @type change so that when a filter adds a type it keeps the type besides changing WebPage to ItemPage. For example is you add a FAQ block, we also add FAQPage to the schema.

This is a companion to https://github.com/Yoast/wpseo-woocommerce/pull/1084

Summary

Relevant technical choices

Technical choices that affect more than this issue:

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• Performance - I have checked that this code doesn't impact performance (greatly).
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• Tested - I have tested this code to the best of my abilities.
• Automated tests - I have added unit tests to verify the code works as intended.
• Testability - I have added unique ids to elements, so they can be located in automated testing.
• I have altered a filename.
  • I have adjusted the ID property accordingly and updated all internal links.
  • I have added the redirect to the _redirects file in the root of the project.

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