Flexbox docs

Updated the flexbox documentation for the current flexbox implementation

docs/objects/Flexbox/addBreak.md

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+## addBreak
+
+### Description
+
+The `addBreak` method adds a line break to the Flexbox container. This causes the subsequent children to start on a new line or column, depending on the flex direction. This is helpful when you want to control the arrangement of children within the Flexbox container.
+
+### Returns
+
+1. `object` The object in use
+
+### Usage
+
+* Creates a default Flexbox, adds some objects to it, and then adds a break before adding more objects.
+
+```lua
+local main = basalt.createFrame()
+local flexbox = mainFrame:addFlexbox()
+flexbox:addButton()
+flexbox:addButton()
+flexbox:addBreak() -- adds a line break
+flexbox:addButton() -- this object will start on a new line
+```