In the Atlas Search online documentation, there is a section containing tutorials for various use cases. One of the tutorials is "Use Synonyms" and is at:

https://www.mongodb.com/docs/atlas/atlas-search/tutorial/synonyms-tutorial/

Within this tutorial, the final section is "Search the Collection". This is broken down into 4 steps. The titles for steps 3 and 4 are incorrect and appear to have been copied from a prior tutorial in the series. The titles do not describe the actual actions to be taken within this tutorial.