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.

Review the current slide show to choose an existing slide, then consult the Appendix in the training manual if you need guidance. Add one or two captions to that slide and verify that they appear correctly in the slide show.

索引モデルが issue の本文から書いたものです。