Changes to Update Document

the request property pricing_tables/items/sections became required

the request property pricing_tables/items/sections/items/default became required

the request property pricing_tables/items/sections/items/rows/items/data became required

the request property pricing_tables/items/sections/items/rows/items/options became required

added the new optional request property pricing_tables/items/sections/items/rows/items/data/images

added the new optional request property pricing_tables/items/sections/items/rows/items/data/pricing_method

added the new optional request property pricing_tables/items/sections/items/rows/items/data/tiers