Updated Container docs

updated docs for container (child instead of object)

docs/objects/Container/setFocusedChild.md

@@ -0,0 +1,38 @@
+## setFocusedObject
+
+### Description
+
+Sets the focused object within the container. When an object is focused, it will receive keyboard events. Only one object can be focused at a time within a container.
+
+### Parameters
+
+1. `object` object - The object to set as the focused object.
+
+### Returns
+
+1. `object` The object in use
+
+### Usage
+
+```lua
+local main = basalt.createFrame()
+local container = main:addFrame()
+local inputField1 = container:addInput("inputField1")
+    :setPosition(2, 2)
+local inputField2 = container:addInput("inputField2")
+    :setPosition(2, 4)
+
+main:addButton()
+    :setPosition(2, 6)
+    :setText("Focus on inputField1")
+    :onClick(function()
+        local focused = container:setFocusedObject(inputField1)
+        if focused then
+            basalt.debug("InputField1 is now focused!")
+        else
+            basalt.debug("Failed to set focus on InputField1!")
+        end
+    end)
+
+basalt.autoUpdate()
+```