Update API docs for fetching a post
Update API docs for fetching a post

neavouli/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextmp-popit,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit,neavouli/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextrepresentative,neavouli/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextrepresentative,mysociety/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextrepresentative,mysociety/yournextmp-popit