adding next section url path (#2742)

adding next section URL path at the end in order to ease readers follow steps

content/docs/introducing-jsx.md

@@ -177,7 +177,7 @@ const element = {
 
 These objects are called "React elements". You can think of them as descriptions of what you want to see on the screen. React reads these objects and uses them to construct the DOM and keep it up to date.
 
-We will explore rendering React elements to the DOM in the next section.
+We will explore rendering React elements to the DOM in the [next section](/docs/rendering-elements.html).
 
 >**Tip:**
 >