Move the 'How to map OpenJDK tests to AQAvit' wiki into /docs

[smlambert]

Move the contents of https://github.com/adoptium/aqa-tests/wiki/How-OpenJDK-tests-map-to-AQAvit-test-targets into https://github.com/adoptium/aqa-tests/tree/master/docs/pages and add a link to it from the https://github.com/adoptium/aqa-tests/blob/master/docs/pages/aqa-reference.markdown file.

[GioChkhaidze]

I'll do it