docs(tutorial/step-7): add doctype directive to example

jesselpalmer · jamesdaily · commit 371a68da127d · 2014-01-26T22:32:13.000-05:00
Closes angular#4552
diff --git a/docs/content/tutorial/step_07.ngdoc b/docs/content/tutorial/step_07.ngdoc
@@ -183,6 +183,7 @@ tag to your `index.html` file as shown below.
 
 __`app/index.html`:__
 <pre>
+<!doctype html>
 <html lang="en" ng-app="phonecatApp">
 <head>
 ...
