Improve swagger docs around skipSnapshot:true #54

The API allows to add two flags when triggering a rebuild of a the tasks of a challenge:

The swagger docs describe them like this:

The first flag (remove) is exposed in the UI as a checkbox, the second is not. The docs also only mention the remove-flag (which is fine, IMO).

My question is: What is a snapshot? What happens when set to false? Is there a disadvantage to setting it to false?

For context, I am debugging maproulette/maproulette-backend#1180 and assume that the snapshot take more time to process because it looks like things are done synchronously so skipping the snapshot should be a good idea.

Suggestion: Clarify the swagger docs

Reference https://osmus.slack.com/archives/C1QN12RS7/p1740545612317079