[Docs][Customization Guide][API] Headlines fix #13088
Merged
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Before:
![image](https://user-images.githubusercontent.com/13198869/132914147-66b5907b-7ddb-4d3a-aba1-19b8d1154405.png)
After:
![image](https://user-images.githubusercontent.com/13198869/132914201-7e151c1b-3abf-4593-94a5-3d4e49210773.png)