Curriculum Update

This PR incorporates a lot of really boring fixes to the curriculum materials in the training guide.  This should be the last of the edits to the training chapters.

- most of the edits are grammatical and language
- also formatting, language etc have been made uniform throughout the different curriculum chapters
I changed all references to Separate Data Store, since that was the official name given to it, aka SDS.  It seemed wrong to have different names for it in different places.