Updated docs

There is still stuff to do

docs/objects/Dropdown/getOffset.md

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+## getOffset
+Returns the current index offset
+
+#### Returns:
+1. `number` offset value
+
+#### Usage:
+* Creates a default dropdown with 6 entries and sets the offset to 3, also prints the current offset.
+```lua
+local mainFrame = basalt.createFrame()
+local aDropdown = mainFrame:addDropdown()
+      :addItem("1. Entry")
+      :addItem("2. Entry")
+      :addItem("3. Entry")
+      :addItem("4. Entry")
+      :addItem("5. Entry")
+      :addItem("6. Entry")
+      :setOffset(3)
+basalt.debug(aDropdown:getOffset())
+```