Add back missing "easy questions" from syllabus guide.

[seanjgildea]

Like "What is REST?", "What are the 4 transaction Isolation levels?". If someone wants to add those back, feel free. Most people will gather those while studying pretty easily though.

[seanjgildea]

This would involve scanning the guide and comparing the doc to the guide. Then editing the doc to add the questions as well as the answer. I will be happy to review and push your pull request. Thanks!