docs: update full border diff after changes in commit #68ffd82 (#31)

docs/tips.md

@@ -20,9 +20,9 @@ You can implement a full border for Yazi via the UI plugin.
 Copy the [`Manager:render` method](https://github.com/sxyazi/yazi/blob/v0.2.3/yazi-plugin/preset/components/manager.lua) _*only*_ to your `~/.config/yazi/init.lua`, then apply the following patch:
 
 ```diff
-@@ -10,16 +10,28 @@
- 		})
- 		:split(area)
+@@ -18,16 +18,28 @@
+function Manager:render(area)
+	local chunks = self:layout(area)
 
 +	local bar = function(c, x, y)
 +		x, y = math.max(0, x), math.max(0, y)