Document how to find the snapshot build created by a merge job

Merge jobs produce distribution snapshot builds with a fresh build of the project with the newly-merged changes and recent, but not-freshly-built, versions of other projects from Nexus. There should be a way to look at a merge job (example merge job) and figure out which distribution snapshot it produced (example snapshots). I currently look at the timing and guess. Find a reliable way and document it in the Distribution Builds Triggered by Merge Jobs section of Int/Pack's RTDs.

Imported from Trello