docs(library): Add audiences / role documentation for withPostGraphQLContext (#689)
docs(library): Add audiences / role documentation for withPostGraphQLContext (#689)

Signed-off-by: petetnt <7e8e42e87574bf369dbd5ced0c3ae052a417e2f7@gmail.com>
calebmer/postgraphql,calebmer/postgraphql,postgraphql/postgraphql,calebmer/postgraphql,postgraphql/postgraphql,postgraphql/postgraphql,calebmer/postgraphql,postgraphql/postgraphql