Fix typos in JSON documentation.

 * Within JSON objects, name/value pairs are represented by a single token.

 *

 * <h3>Parsing JSON</h3>

 * To create a recursive descent parser your own JSON streams, first create an

 * entry point method that creates a {@code JsonReader}.

 * To create a recursive descent parser for your own JSON streams, first create

 * an entry point method that creates a {@code JsonReader}.

 *

 * <p>Next, create handler methods for each structure in your JSON text. You'll

 * need a method for each object type and for each array type.

 * This code encodes the above structure: <pre>   {@code

 *   public void writeJsonStream(OutputStream out, List<Message> messages) throws IOException {

 *     JsonWriter writer = new JsonWriter(new OutputStreamWriter(out, "UTF-8"));

 *     writer.setIndentSpaces(4);

 *     writer.setIndent("  ");

 *     writeMessagesArray(writer, messages);

 *     writer.close();

 *   }