Today I started to see this warning when visiting a docs.automic.com link from the CA Communities site.
It would probably be a good idea to add docs.automic.com to the list of trusted CA sites.
I had try clicking on some link that are pointing to docs.automic.com (such as one here where wolfgang had link in this thread: Automation Engine v11 - Retrieve/set a copy of the job report (Windows Job) ). I also try creating a few hyperlink to docs, ca and other site but am unable to reproduce the error you are seeing.
Can you try the link again and let me know if you still see that message and if you do, can you provide the post in which you are clicking that link on.