anchor.diff:  attributes `:product/brand` and `:product/brand-id`. And this is how autocomplete is
   done via the `index-io`.
   
  -== `index-attributes`
  +== index-attributes
   
   [source,clojure]
   ----
  
positive.code: example in the getting started section, each piece of the index will be listed with
  it's explanation.
  
  == `index-resolvers`
  
  [source,clojure]
  ----
  
negative.code: ;     ::pc/resolve (fn ...)}
  ----
  
  == index-mutations
  
  This index contains the mutation definitions, its similar to the `index-resolvers`.
  
  == index-oir
  
  [source,clojure]
  ----
  