Updated docs

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docs/objects/List/getItemIndex.md

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+## getItemIndex
+returns the item index of the currently selected item
+
+#### Returns:
+1. `number` The current index
+
+#### Usage:
+* Creates a default list with 3 entries selects the second entry and prints the currently selected index.
+```lua
+local mainFrame = basalt.createFrame()
+local aList = mainFrame:addList()
+aList:addItem("1. Entry")
+aList:addItem("2. Entry",colors.yellow)
+aList:addItem("3. Entry",colors.yellow,colors.green)
+aList:selectItem(2)
+basalt.debug(aList:getItemIndex())
+```