Update displaying_formatted_dates_with_moment_js.md

Fenced code blocks are being rendered like inline code. Seems like the difference is a newline. If that doesn't fix it, still nice to have it in the markdown.
Merge pull request #916 from jehoshua02/patch-3

Update displaying_formatted_dates_with_moment_js.md
Merge branch 'master' of https://github.com/emberjs/website