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 to choose an existing slide, then consult the Appendix in the training manual if needed. Done means adding one or two suitable captions to that slide and confirming they appear in the slide show.

Written by the indexing model from the issue text.