Improving embed doc. The example code was missing. (codesandbox#551)

Author: robertheessels

packages/homepage/content/docs/2-embedding.md

@@ -49,6 +49,12 @@ This embed is focused on being as light as possible:
 
 `https://codesandbox.io/embed/new?codemirror=1`
 
+Use this code to embed:
+
+`<iframe src="https://codesandbox.io/embed/new?codemirror=1" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>`
+
+That will give to a result like this:
+
 <iframe src="https://codesandbox.io/embed/new?codemirror=1" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>
 
 ### Code Example Embed
@@ -57,4 +63,10 @@ You can also use CodeSandbox to show code examples, with highlighted lines. This
 
 `https://codesandbox.io/embed/new?codemirror=1&highlights=11,12,13,14`
 
+Use this code to embed:
+
+`<iframe src="https://codesandbox.io/embed/new?codemirror=1&highlights=11,12,13,14" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>`
+
+That will give to a result like this:
+
 <iframe src="https://codesandbox.io/embed/new?codemirror=1&highlights=11,12,13,14" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>