Updated docs

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docs/objects/List/getItemCount.md

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+## getItemCount
+Returns the current item count
+
+#### Returns:
+1. `number` The item list count
+
+#### Usage:
+* Creates a default list with 3 entries and prints the current item count.
+```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)
+basalt.debug(aList:getItemCount())
+```