Merge pull request #9666 from yasithsamaranayake/update-ubuntu-compatibility-4.2.0

docs: update Ubuntu compatibility for version 4.2.0 (Resolves #9640)

Author: tharikaGitHub

en/docs/install-and-setup/setup/reference/product-compatibility.md

@@ -13,7 +13,7 @@ As WSO2 API Manager is a Java application, you can generally run it on most oper
 |**Operating System**|**Versions**  |
 |--------------------|--------------|
 |Windows             | 2016         |
-|Ubuntu              | 18.04, 20.04, 22.04 |
+|Ubuntu              | 22.04 |
 |Red Hat Enterprise Linux   | 7.0, 8.7, 9.3   |
 |CentOS              | 7.4, 7.5     |
 |Rockyise Linux   | 9.3   |