Updating dataset request letter

- Made changes previously made to data inventory request to reflect here too
- Changed opening from 'requesting the following public records data' to 'requesting to inspect' because inspection is free and requesting the data itself (e.g. copies) costs money
- Removed 'public' in the opening sentence, because if you request only the public data in the dataset, the agency won't have to acknowledge specific denials
- Added temporary classification to potential denial reason
Updating citations, adding additional background information
Add links, update disclaimer, add placeholder for case law citations