A word or expression to introduce one of different example cases
Solution 1:
How about "Exercise (Inserting Images)"?
or Lesson instead of exercise, or just keep example but parenthetically append the disclaimer that what's shown is just one example out of other possibilities (i.e., in this case, you've chosen the example of "(Inserting Images)")
It really depends on the precedent you've set in the manual (if you have yet), and the critical thing being that there is unexceptional consistency