Merge pull request graphql#394 from nathanchapman/patch-1

Update APIReference-Utilities.md

Author: wincent

site/graphql-js/APIReference-Utilities.md

@@ -92,13 +92,13 @@ var { introspectionQuery } = require('graphql'); // CommonJS
   <li>
     <a href="#isvalidjsvalue">
       <pre>function isValidJSValue</pre>
-      Determins if a JavaScript value is valid for a GraphQL type.
+      Determines if a JavaScript value is valid for a GraphQL type.
     </a>
   </li>
   <li>
     <a href="#isvalidliteralvalue">
       <pre>function isValidLiteralValue</pre>
-      Determins if a literal value from an AST is valid for a GraphQL type.
+      Determines if a literal value from an AST is valid for a GraphQL type.
     </a>
   </li>
 </ul>