Update graphql-clj Clojure example

Author: tendant

site/code/index.html.js

@@ -306,23 +306,19 @@ A Clojure library that provides a GraphQL implementation.
 Code that executes a hello world GraphQL query with \`graphql-clj\`:
 
 \`\`\`clojure
-(require '[graphql-clj.parser :as parser])
-(require '[graphql-clj.type :as type])
 
-(def parsed-schema (parser/parse "type Query {
+(def schema "type QueryRoot {
     hello: String
-  }"))
-
-(def type-schema (type/create-schema parsed-schema))
+  }")
 
 (defn resolver-fn [type-name field-name]
-  (cond
-    (and (= "Query" type-name) (= "hello" field-name)) (fn [context parent & rest]
-                                                         "Hello world!")))
+  (get-in {"QueryRoot" {"hello" (fn [context parent & rest]
+                              "Hello world!")}}
+          [type-name field-name]))
 
 (require '[graphql-clj.executor :as executor])
 
-(executor/execute nil type-schema resolver-fn "{ hello }")
+(executor/execute nil schema resolver-fn "{ hello }")
 \`\`\`
 
   - [lacinia](https://github.com/walmartlabs/lacinia): A full implementation of the GraphQL specification that aims to maintain external compliance with the specification.