fix broken recipe collection and make pets work (#1664)

Author: jamiesmith

docs/_docs/13-collections.md

@@ -7,7 +7,7 @@ last_modified_at: 2018-03-20T16:00:02-04:00
 
 Collections like posts and pages work as you'd expect. If you're new to them be sure to read [Jekyll's documentation](https://jekyllrb.com/docs/collections/).
 
-The theme has been built with collections in mind and you will find [several examples]({{ "/collection-archive/" | relative_url }}) on the demo site ([portfolio]({{ "/portfolio/" | relative_url }}), [recipes]({{ "/recipes/" | relative_url }}), pets). 
+The theme has been built with collections in mind and you will find [several examples]({{ "/collection-archive/" | relative_url }}) on the demo site ([portfolio]({{ "/portfolio/" | relative_url }}), [recipes]({{ "/recipes/" | relative_url }}), [pets]({{ "/pets/" | relative_url }})). 
 
 **Collections in the Wild:** This set of documentation is also [built as a collection](https://github.com/{{ site.repository }}/blob/master/docs/_docs/) if you're looking for a fully fleshed out example to inspect.
 {: .notice--info}

docs/_pages/pets.md

@@ -0,0 +1,10 @@
+---
+title: Pets
+layout: collection
+permalink: /pets/
+collection: pets
+entries_layout: grid
+classes: wide
+---
+
+Sample document listing for the collection `_pets`.

docs/_pages/recipes-archive.md

@@ -2,7 +2,7 @@
 layout: collection
 title: "Recipes"
 collection: recipes
-permalink: /recipes-archive/
+permalink: /recipes/
 author_profile: false
 ---