docs: update JSON representation example in README for Uint64

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Author: impawstarlight

lib/node_modules/@stdlib/number/uint64/ctor/README.md

@@ -161,13 +161,7 @@ Returns a [JSON][json] representation of a `Uint64` instance. [`JSON.stringify()
 var x = new Uint64( 5 );
 
 var o = x.toJSON();
-/*
-  {
-    "type": "Uint64",
-    "high": 0,
-    "low": 5
-  }
-*/
+// returns { 'type': 'Uint64', 'words': [ 0, 5 ] }
 ```
 
 To [revive][mdn-json-parse] a `Uint64` instance from a [JSON][json] string, see [@stdlib/number/uint64/reviver][@stdlib/number/uint64/reviver].