Updating people api documentation to include rnc id and rnc registration id descriptions.
Complete donation api response examples with recently added donor fields.
Use a writable field in the update endpoint example.
Update donations api create endpoint example.
Fix syntax error in a json example.
Merge pull request #2 from 3dna/batchelor/people_rnc_id_rnc_regid

Updating people api documentation to include rnc id and rnc registration...
Updating donations api documentation to include rnc id and rnc registration id descriptions for the donor.
List the previous donation webhook payload sample in the webhook documentation.
Merge branch 'master' of github.com:3dna/api_docs into miki/update_donation_webhook_doc