docs(createSlider): fixes broken p5.Element link

Author: emnul

src/content/reference/en/p5/createSlider.mdx

@@ -150,7 +150,7 @@ params:
     type: Number
     optional: true
 return:
-  description: new <a href="#/p5.Element">p5.Element</a> object.
+  description: new <a href="/reference/p5/p5.Element/">p5.Element</a> object.
   type: p5.Element
 chainable: false
 ---