Fix to emoji tests

tests/chapter2-exercise-emoji-tests.md

@@ -68,7 +68,7 @@ Let's see what it looks like:
     >>> b.load(url)
     create_text: x=1 y=1 text=H
     create_text: x=2 y=1 text=i
-    create_oval: x=2 y=2 image=PhotoImage('openmoji/1F600.png')
+    create_image: x=2 y=2 image=PhotoImage('openmoji/1F600.png')
     create_text: x=2 y=3 text=a
     create_text: x=1 y=4 text=n
     create_text: x=2 y=4 text=d