docs(index): tidy and update JSDoc comments for index.js

Document missing param for `options.library`.

Author: remarkablemark

index.js

@@ -7,10 +7,11 @@ var domParserOptions = { decodeEntities: true, lowerCaseAttributeNames: false };
 /**
  * Converts HTML string to React elements.
  *
- * @param  {String}   html                    - The HTML string to parse to React.
- * @param  {Object}   [options]               - The parser options.
- * @param  {Function} [options.replace]       - The replace method.
- * @return {JSX.Element|JSX.Element[]|String} - Returns React element(s), string, or empty array.
+ * @param  {String}   html                    - HTML string.
+ * @param  {Object}   [options]               - Parser options.
+ * @param  {Object}   [options.library]       - Library for React, Preact, etc.
+ * @param  {Function} [options.replace]       - Replace method.
+ * @return {JSX.Element|JSX.Element[]|String} - React element(s), empty array, or string.
  */
 function HTMLReactParser(html, options) {
   if (typeof html !== 'string') {