Added examples

lib/locomotive/liquid/drops/content.rb

@@ -9,10 +9,28 @@ module Locomotive
           self._source._id.to_s
         end
         
+        # Returns the next content for the parent content type.
+        # If no content is found, nil is returned.
+        #
+        # Usage:
+        #
+        # {% if article.next %}
+        # <a href="/articles/{{ article.next._permalink }}">Read next article</a>
+        # {% endif %}
+        #
         def next
           self._source.next.to_liquid
         end
         
+        # Returns the previous content for the parent content type.
+        # If no content is found, nil is returned.
+        #
+        # Usage:
+        #
+        # {% if article.previous %}
+        # <a href="/articles/{{ article.previous._permalink }}">Read previous article</a>
+        # {% endif %}
+        #
         def previous
           self._source.previous.to_liquid
         end