Flexbox docs

Updated the flexbox documentation for the current flexbox implementation

docs/objects/Flexbox/getDirection.md

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+## getDirection
+
+### Description
+
+Returns the current direction in which the child objects are arranged within the Flexbox.
+
+### Returns
+
+1. `string` The direction in which the child objects are arranged. Possible values are: row, column.
+
+### Usage
+
+* Creates a default Flexbox, sets the direction, and then retrieves it.
+
+```lua
+local main = basalt.createFrame()
+local flexbox = mainFrame:addFlexbox()
+      :setDirection("column")
+local direction = flexbox:getDirection() -- returns "column"
+```