Upgrade guide: Fix a broken link

/category/manipulation/ -> https://api.jquery.com/category/manipulation/

Fixes #200
Closes #201

Author: yhor1e

pages/upgrade-guide/3.5.md

@@ -27,7 +27,7 @@ elem.html( sanitizedHtml );
 
 ### Description of the change
 
-`jQuery.htmlPrefilter` modifies and filters HTML strings passed through [jQuery manipulation methods](/category/manipulation/). The default value of this function in jQueries older than 3.5.0 used to replace XHTML-like tags with versions that work in HTML. For example, previously the following:
+`jQuery.htmlPrefilter` modifies and filters HTML strings passed through [jQuery manipulation methods](https://api.jquery.com/category/manipulation/). The default value of this function in jQueries older than 3.5.0 used to replace XHTML-like tags with versions that work in HTML. For example, previously the following:
 ```js
 jQuery( "<div/><span/>" );
 ```