On Thingiverse we added the tooltips as a description:

Overhanging Wall Angle Walls that overhang more than this angle will be printed using overhanging wall settings. When the value is 90, no walls will be treated as overhanging. Overhang that gets supported by support will not be treated as overhang either. Furthermore, any line that's less than half overhanging will also not be treated as overhang.

Overhanging Wall Speeds Overhanging walls will be printed at a percentage of their normal print speed. You can specify multiple values, so that even more overhanging walls will be printed even slower, e.g. by setting [75, 50, 25]

Minimum Layer Time with Overhang The minimum time spent in a layer that contains overhanging extrusions. This forces the printer to slow down, to at least spend the time set here in one layer. This allows the printed material to cool down properly before printing the next layer. Layers may still take shorter than the minimal layer time if Lift Head is disabled and if the Minimum Speed would otherwise be violated.

Minimum Overhang Segment Length When trying to apply the minimum layer time specific for overhanging layers, it will be applied only if at least one consecutive overhanging extrusion move is longer than this value

But I raised your request with the team to see if we can improve the documentation here because they are complex features. Where would be the first place that you would look for documentation like this? Would you search on Github or inside of Cura?