which version of AEM are you using, it is redirecting to me properly.
Are you facing this issue for all instances or only one of your instance ?
When I click help button in siteadmin page or sidekick,I am getting the message as Add Content here in new tab.I have attached my screenshot.
Which AEM version is yours?
Have you tried to customized anything in this file sidekick.js?
Are you seeing this in all browser?
Did you try creating new AEM instance and see the behavior?
AFAIK, this path does not exist by default in AEM ( m referring 6.1 )
First, AEM tries to find this path on your local aem instance, if it does not exist then it opens the links in adobe documentation. (which practically happens in my case)
But in your case someone has created this path so it opens the page from local Instance
Please check why it was created....there has to be some reason...
I am asuming you are aware why this path was created.
Try deleting the path from /libs and see the behavior
Make sure you take backup prior deleting
You can delete that node unless you are not overriding the same.
Also, is this node exists on every new instance you are creating ?? as I also dont see that node as @edubey mentioned.