Add help text for intervals

ui/config.go

@@ -242,12 +242,14 @@ func ConfigGui(config *koanf.Koanf) {
 			main.SetTitle("Configure Intervals")
 			main.Clear()
 			main.AddItem(intervalsForm, 0, 1, true)
+			main.AddItem(tview.NewTextView().SetText("Intervals are a number + letter\n\nUse\ns for seconds\nm for minutes\nh for hours\nd for days\nw for weeks"), 0, 1, false)
 			app.SetFocus(intervalsForm)
 		}
 		if title == "HDMI On/Off" {
 			main.SetTitle("Configure HDMI On/Off")
 			main.Clear()
 			main.AddItem(hdmiForm, 0, 1, true)
+			main.AddItem(tview.NewTextView().SetText("These values are date+time combos\n\nPlease see https://www.freedesktop.org/software/systemd/man/systemd.time.html for details\n\nONLY adjust the times (24h format) if unsure of what to change"), 0, 1, false)
 			app.SetFocus(hdmiForm)
 		}
 	})