removed markdown code markers which were rendering in the generated AR querying guide

guides/source/active_record_querying.md

@@ -1210,9 +1210,7 @@ class User < ActiveRecord::Base
   scope :active, -> { where state: 'active' }
   scope :inactive, -> { where state: 'inactive' }
 end
-```
 
-```ruby
 User.active.inactive
 # => SELECT "users".* FROM "users" WHERE "users"."state" = 'active' AND "users"."state" = 'inactive'
 ```