- Adds the new api_version field and related info to 'Request
Formatting'.
- Restructures request formatting to use parameter tables.
- Removes some redundant sections from 'Get Started with the rippled
API' and links relevant references instead (this partially addresses
issue 584 but does not fix it)
- Fixes a typo in 'Admin Access' section and clarifies it
- Adds the new API version universal error and sorts the universal
errors alphabetically.