Issue Summary

Headers that are using parentheses are getting their anchor links broken when the page is updated through Rest API.

Steps to Reproduce

1. Create a Page
2. insert a header that contains parentheses,
3. Try to create an anchor link for it using the update API that contains the same parentheses that are displayed on the header created before,
4. For Example:

5. <a href="#anchor-(test)">
   

Expected Results

It should create an anchor link that points to the referenced header.

Actual Results

It generates a broken link and nothing happen when you click on it.

Workaround

replace the parentheses at the href= for their URL format that is %28 for open parentheses and %29 for close parentheses. like the example below:

<a href="#anchor-%28test%29">