Fix broken link, Fixes #418

docs/01_Features/GitHub_Flavored_Markdown.md

@@ -113,4 +113,4 @@ Here's an image.
 
 Note: to use images on a landing page (index.md), prefix the image URL with the name of the directory it appears in, omitting the numerical prefix used to order the sections. For example in this section, to display this image on the landing page (index.md), the URL for the image would be "Features/sampleimage.png" to display the same image.
 
-*View the [source of this content](http://github.github.com/github-flavored-markdown/sample_content.html).*
+*View the [source of this content](https://github.com/justinwalsh/daux.io/blob/master/docs/01_Features/GitHub_Flavored_Markdown.md).*