Changes to List curated collections

the response property items/description became nullable for the status 200

the response property items/previewOrgs/items/avatarUrl became nullable for the status 200

the response property items/previewOrgs/items/description became nullable for the status 200

the response property items/previewOrgs/items/domain became nullable for the status 200

the response property items/previewOrgs/items/githubHandle became nullable for the status 200

added subschema #1 subschema #2 to the items/previewMembers/items response property oneOf list for the response status 200

response property items/description list-of-types was narrowed by removing types null from media type application/json of response 200

response property items/previewOrgs/items/avatarUrl list-of-types was narrowed by removing types null from media type application/json of response 200

response property items/previewOrgs/items/description list-of-types was narrowed by removing types null from media type application/json of response 200

response property items/previewOrgs/items/domain list-of-types was narrowed by removing types null from media type application/json of response 200

response property items/previewOrgs/items/githubHandle list-of-types was narrowed by removing types null from media type application/json of response 200

removed subschema #1 subschema #2 from the items/previewMembers/items response property oneOf list for the response status 200