INFO: matplotlib marker properties

This documents the properties that markers can have in matplotlib. See [this link](https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.scatter.html) for a more complete list of scatter properties; some of the highlights are below.

| Property | Default | Description |
| ------- | ------ | ---------- |
| marker | "o" (circle) | Marker symbol |
| c | Depends on the color cycle | Color of the marker -- can be single color or array |
| cmap | 'viridis' | colormap to use for the markers. |
| norm, vmin, vmax | see documentation | parameters for applying colormap to data if cmap is used |
| alpha | none | marker opacities |
| s | unclear | Size of markers in points**2 |
| linewidths | 1.5 | float or array, width of marker edges |
| edgecolors | face color | color or sequence of colors |

Start with the linked matplotlib.pyplot.scatter documentation and review the issue's property table. Locate the project's documentation entry point, add the listed marker properties with accurate defaults and descriptions, and verify that the documentation renders correctly.

Written by the indexing model from the issue text.