Add how to configure default color scheme using 'default-cs' element in our developer guide (in LDN).
As in the fix for
LPS-44156, we can add '<default-cs>true</default-cs>' to configure default scheme for theme.
Details can be found in this commit: https://github.com/liferay/liferay-portal/commit/0916e387d6a5dc18fc71c6693a3b26f138c5148f
These information is not included in our user guide. It would be helpful for customer if we can add it into our developer guide (in LDN): https://dev.liferay.com/develop/tutorials/-/knowledge_base/6-2/specifying-color-schemes