Fix typo and improve wording in README

Author: remarkablemark

README.md

@@ -15,7 +15,7 @@ var Parser = require('html-react-parser');
 var reactElement = (
     Parser('<p>Hello, world!</p>') // equivalent to `React.createElement('p', {}, 'Hello, world!')`
 );
-ReactDOM.render(reactElement, document.getElementById('node'));
+require('react-dom').render(reactElement, document.getElementById('root'));
 ```
 
 ## Installation
@@ -49,7 +49,7 @@ ReactDOM.render(
 // nested elements
 ReactDOM.render(
     Parser('<ul><li>inside</li></ul>'),
-    document.getElementedById('root')
+    document.getElementById('root')
 );
 
 // attributes are preserved
@@ -65,7 +65,7 @@ ReactDOM.render(
 
 `replace` allows you to swap an element with your own React element.
 
-The output of `domNode` is the same as the output from [htmlparser2.parseDOM](https://github.com/fb55/domhandler#example).
+The `domNode` object has the same schema as the output from [htmlparser2.parseDOM](https://github.com/fb55/domhandler#example).
 
 ```js
 var Parser = require('html-react-parser');
@@ -90,8 +90,7 @@ var reactElement = Parser(html, {
     }
 });
 
-var ReactDOM = require('react-dom');
-ReactDOM.render(reactElement, document.getElementById('root'));
+require('react-dom').render(reactElement, document.getElementById('root'));
 // <div><span style="font-size: 42px;">replaced!</span></div>
 ```