Hmm. I think there have been some changes to links to documents, in the last week or so. Here are some that say Obsolete pages from my bookmarks:
My memory is that I encountered this often, following links on a front page. A coworker had a similar experience. If I pretend to be a new visitor I don't see many obsolete pages, like I remember.
It might be notable that I now see a path through the documentation that I had to learn. So, I am not encountering obsolete pages as much.
My first experiences were scanning over alfresco.com looking for something that says "documentation".
Then using a search engine and finding links that were within community.alfresco.org.
Then clicking the logo in the upper right, trying to go to the top of documentation, seeing nothing that says "documentation" there.
Then clicking Wiki and seeing what looks like a forum.
Gradually, I noticed that the forum pages have a "documents" filter.