In Your Second iOS app, there is a portion that says the following:
After you finish laying out the cells in the table, the detail scene should look similar to this:
However, mine has Section-1, Section-2, Section-3 right above each section. I get the feeling that they want 1 section with three cells.
Can you tell which?

You incremented the number of sections by mistake instead of incrementing the number of rows. Which you should have done.
Edited to add
You get to this by highlighting the Table View Section in the controller scene and editing the number of rows in the right hand panel.
I picture makes this clearer: