Update FAQs on Threadx.io

We have a few minor (but important) changes to make to the ThreadX FAQs. Answers to 3 questions need to be updated. This document is the updated text for those questions and answers:

https://docs.google.com/document/d/1SlrOSZ1DtfmaUM9oll4KrWDGPO6o1Prgs5oFDswwUrQ/edit

Please let me know of any questions. Thanks!