* First take at StringStore/Vocab docs
Things to check:
1. The mysterious vocab members
2. How to make table of contents? Is it autogenerated?
3. Anything I missed / needs more detail?
* Update docs
* Apply suggestions from code review
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
* Updates based on review feedback
* Minor fix
* Move example code down
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
