Treeview Docs

Added Treeview docs
Improved some stuff in the treeview object

docs/objects/Treeview/setText.md

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+## setText
+
+### Description
+
+The `setText` method allows you to change the text value of a node within a Treeview object. This can be useful when you need to update the text content of a node due to changes in your application's data or based on user input.
+
+### Parameters
+
+1. `string` The new text value for the node.
+
+### Returns
+
+1. `node` The node in use
+
+### Usage
+
+* Creates a Treeview, adds a child node to the root node, and updates the text value of the child node:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local treeview = mainFrame:addTreeview()
+
+local rootNode = treeview:getRoot()
+local childNode = rootNode.addChild("Child Node 1")
+
+-- Update the text value of the child node
+childNode.setText("Updated Child Node 1")
+
+basalt.autoUpdate()
+```
+
+In this example, a Treeview object is created and added to the mainFrame. The `getRoot` method is used to access the root node, and a child node is added to it using the `addChild` method. The `setText` method is then called on the child node to update its text value.