Fixed broken image link for EmbeddedAppExample.png

[Za1batsu]

Image link for EmbeddedAppExample.png failed to load. Fixed link to load original image. Did not touch source code.

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[vjeux]

I can see the image just fine?

http://facebook.github.io/react-native/docs/embeded-app.html#compile-and-run

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[Za1batsu]

I was referring to the page on GitHub directly.

https://github.com/facebook/react-native/blob/master/docs/EmbeddedApp.md

[Za1batsu]

@vjeux This change fixed the image problem on GitHub, but have inadvertently broke the one on the official page. Sent and email to your vjeuxx@gmail.com regarding this.