Flexbox docs

docs/objects/Flexbox/getSpacing.md

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+## getSpacing
+
+### Description
+
+Returns the space between objects
+
+### Returns
+
+1. `number` Number of pixels of spacing between each object
+
+### Usage
+
+* Creates a default flexbox and prints the default spacing.
+
+```lua
+local main = basalt.createFrame()
+local flexbox = mainFrame:addFlexbox()
+basalt.debug(flexbox:getSpacing())
+```