LPS-43720 new property in portal.properties

Hey Jim,

I'm working on a set of changes and codewise it's ok but Brian wanted to check the new property's description with you.

Here is the full code, can you please check the text in this commit: https://github.com/matethurzo/liferay-portal/commit/0bc603509e5f18ab78c7c8e3d51e43f22e18e52f

I'm not providing any additional information to you, because I'm curious if I wrote something what actually makes sense :) But of course if you need any alignment or more information just let me know and I'll gladly answer.

Thanks,

Máté