Improved field descriptions on Marketplace API

We have improved our Marketplace API documentation on the following endpoints:

Match multiple received SKUs:

• We have corrected the skuSpecification fields that were documented as mandatory, but are actually optional.
• We have corrected the request's body type. It is an array of objects, and not a single object.
• We have improved descriptions of the matchId, matcherId and version fields, pointing out what calls to perform to retrieve their value.

Get Suggestions API:

• We have added the type parameter to this endpoint, pointing out whether the SKU suggestion was sent for the first time (new), or if it's an update to suggestions previously sent (update).