LRDOCS-956 layout.reset.portlet.ids property comments

Hi Shuyang,

I edited your property comments. Your description at https://in.liferay.com/web/global.engineering/forums/-/message_boards/message/2321022 was helpful. I made some edits. In particular, I left out the part about mentioning when the previous layout is the same as the layout of the URL. I found it unnecessary since we're already saying the behavior will ALWAYS take place for handling URLs for these portlets.

Does this look good to you?

Thanks.