Applied some of the changes based on Jinmei's comments

- Updated abstract slightly to indicate 3315/3633 changes are to address issues.
- Removed paragraph to describe handling of options from section 1 and worked into section 4.
- Removed framework text from section 1.
- Added that IA_TA is (mostly) out of scope for this document.
- Added an example for T1/T2 times to 4.3.
- Updated Acknowledgements to include Jinmei and Andrew and extend it to include review comments.