Updated docs

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docs/objects/Dropdown/setDropdownSize.md

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+## setDropdownSize
+Sets the size of the opened dropdown
+
+#### Parameters: 
+1. `number` The width value
+2. `number` The height value
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Creates a default dropdown, adds 3 entries and sets the dropdown size to 15w, 8h
+```lua
+local mainFrame = basalt.createFrame()
+local aDropdown = mainFrame:addDropdown():setDropdownSize(15,8)
+aDropdown:addItem("1. Entry")
+aDropdown:addItem("2. Entry")
+aDropdown:addItem("3. Entry")
+```
+```xml
+<dropdown dropdownWidth="15" dropdownHeight="8">
+  <item><text>1. Entry</text></item>
+  <item><text>2. Entry</text></item>
+  <item><text>3. Entry</text></item>
+</dropdown>
+```