Documentation updates

[jpmckinney]

• [ ] Update Jurisdiction Objects: documents old-style jurisdiction https://open-civic-data.readthedocs.io/en/latest/data/jurisdiction.html
• [x] Edit the Jurisdiction's Metadata: uses old-style jurisdiction as example
• [x] Testing your scraper: scraped_data is _data, scrape_cache is _cache, --fast is --fastmode

Correct all mentions of:

• [x] MongoDB
• [ ] get_scraper
• [x] scrape_* (e.g. scrape_people)
• [x] get_* (e.g. get_people) becomes scrape
• [x] Legislator

[rshorey]

"Write a Scraper" documentation has all been updated and tested.