Add a Caption To an Existing Slide

## Can you think of a better caption?
Each slide can have more than one caption. Check out the current slide show and add a caption (or two).
If you need help, check out the Appendix in the training manual.

Start by reviewing the current slide show and the Appendix in the training manual to understand the existing captions and the expected style. Add one or two captions to an existing slide, then confirm the updated slide displays correctly and the caption improves it.

索引モデルが issue の本文から書いたものです。