Doc fix

README.md

@@ -155,7 +155,7 @@ var md = require('markdown-it')({
 });
 ```
 
-Or with full wrapper override (if you need assign class to \<pre>):
+Or with full wrapper override (if you need assign class to `<pre>`):
 
 ```js
 var hljs = require('highlight.js') // https://highlightjs.org/

lib/index.js

@@ -196,7 +196,7 @@ function normalizeLinkText(url) {
  * });
  * ```
  *
- * Or with full wrapper override (if you need assign class to <pre>):
+ * Or with full wrapper override (if you need assign class to `<pre>`):
  *
  * ```javascript
  * var hljs = require('highlight.js') // https://highlightjs.org/