Updates the lost-vars docs to be a variable

This probably will be updated later, but this should make it work for now.

Author: peterramsing

docs/_docs/lost-vars.md

@@ -2,7 +2,7 @@
 title: "Lost Variables"
 nav: "lost-vars"
 code-example: "true"
-type: "function"
+type: "variable"
 description: "Use to output Lost Variables anywhere in the project to help consistency and readability."
 rules:
   - rule: "gutter"
@@ -17,4 +17,4 @@ rules:
   padding: lost-vars('gutter-local'); /* 50px */
   margin-top: lost-vars('gutter'); /* 30px default gutter */
 }
-{% endhighlight %}
+{% endhighlight %}