Refactor documentation for addBorder and getRelativePosition methods in VisualElement class

src/elements/VisualElement.lua

@@ -889,10 +889,9 @@ function VisualElement:isFocused()
     return self:hasState("focused")
 end
 
---- Adds or updates a drawable character border around the element using the canvas plugin.
---- The border will automatically adapt to size/background changes because the command
---- reads current properties each render.
--- @param colorOrOptions any Border color or options table
+--- Adds or updates a drawable character border around the element using the canvas plugin. The border will automatically adapt to size/background changes because the command reads current properties each render.
+--- @param colorOrOptions any Border color or options table
+--- @param sideOptions? table Side options table (if color is provided as first argument)
 --- @return VisualElement self
 function VisualElement:addBorder(colorOrOptions, sideOptions)
     local col = nil