Clarify hugo new command in types.md

Elsewhere in the docs commands are entered as code, so to be consistent with that, added backticks and the word hugo.

docs/content/content/types.md

@@ -11,7 +11,7 @@ weight: 40
 ---
 
 Hugo has full support for different types of content. A content type can have a
-unique set of meta data, template and can be automatically created by the new
+unique set of meta data, template and can be automatically created by the ``hugo new``
 command through using content [archetypes](/content/archetypes/).
 
 A good example of when multiple types are needed is to look at [Tumblr](https://www.tumblr.com/). A piece