📝 fix "utility" typos (graphql#23)

Author: dmnd

site/docs/APIReference-Utilities.md

@@ -1,11 +1,11 @@
 ---
-title: Utilties
+title: Utilities
 layout: ../_core/DocsLayout
 category: API Reference
 permalink: /docs/api-reference-utilities/
 ---
 
-The `graphql/utilites` module contains common useful computations to use with
+The `graphql/utilities` module contains common useful computations to use with
 the GraphQL language and type objects.
 
 ```js