Minor edits

website/source/docs/builders/null.html.markdown

@@ -7,7 +7,7 @@ page_title: "Null Builder"
 
 Type: `null`
 
-The null builder is not really a builder, it just setups a SSH connection
+The null builder is not really a builder, it just sets up an SSH connection
 and runs the provisioners. It can be used to debug provisioners without
 incurring high wait times. It does not create any kind of image or artifact.
 
@@ -27,8 +27,8 @@ no provisioners are defined, but it will connect to the specified host via ssh.
 
 ## Configuration Reference
 
-Configuration options are organized below into two categories: required and
-optional. Within each category, the available options are alphabetized and
+Configuration options are organized into two categories: `required` and
+`optional`. Within each category, the available options are alphabetized and
 described.
 
 ### Required: