Updated docs

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docs/objects/Frame/showBar.md

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+## showBar
+Toggles the frame's upper bar
+
+#### Parameters: 
+1. `boolean | nil` Whether the frame's bar is visible or if supplied `nil`, is automatically visible
+
+#### Returns:
+1. `frame` The frame being used
+
+#### Usage:
+* Sets myFrame to have a bar titled "Hello World!" and subsequently displays it.
+```lua
+myFrame:setBar("Hello World!"):showBar()
+```
+```xml
+<frame bar="true"></frame>
+```