Update maps.md (#588)

Change order here to match order shown in previous snippet of this test.

maps.md

@@ -508,8 +508,8 @@ There is no refactoring we need to do on this since it was a simple change. Howe
 t.Run("existing word", func(t *testing.T) {
 	word := "test"
 	definition := "this is just a test"
+    dictionary := Dictionary{word: definition}
 	newDefinition := "new definition"
-	dictionary := Dictionary{word: definition}
 
 	err := dictionary.Update(word, newDefinition)