Merge pull request markedjs#1552 from vmlaguna/patch-1

Typo: Fix link to USING_PRO.md

docs/USING_ADVANCED.md

@@ -49,7 +49,7 @@ console.log(marked(markdownString));
 |langPrefix  |`string`  |`'language-'`|v0.3.0|A string to prefix the className in a `<code>` block. Useful for syntax highlighting.|
 |mangle      |`boolean` |`true`   |v0.3.4   |If true, autolinked email address is escaped with HTML character references.|
 |pedantic    |`boolean` |`false`  |v0.2.1   |If true, conform to the original `markdown.pl` as much as possible. Don't fix original markdown bugs or behavior. Turns off and overrides `gfm`.|
-|renderer    |`object`  |`new Renderer()`|v0.3.0|An object containing functions to render tokens to HTML. See [extensibility](USING_PRO.md) for more details.|
+|renderer    |`object`  |`new Renderer()`|v0.3.0|An object containing functions to render tokens to HTML. See [extensibility](/#/USING_PRO.md) for more details.|
 |sanitize    |`boolean` |`false`  |v0.2.1   |If true, sanitize the HTML passed into `markdownString` with the `sanitizer` function.<br>**Warning**: This feature is deprecated and it should NOT be used as it cannot be considered secure.<br>Instead use a sanitize library, like [DOMPurify](https://github.com/cure53/DOMPurify) (recommended), [sanitize-html](https://github.com/apostrophecms/sanitize-html) or [insane](https://github.com/bevacqua/insane) on the output HTML! |
 |sanitizer   |`function`|`null`   |v0.3.4   |A function to sanitize the HTML passed into `markdownString`.|
 |silent      |`boolean` |`false`  |v0.2.7   |If true, the parser does not throw any exception.|