The Upgrade link under the first bullet appears to be broken.
I was able to deduce what the link is supposed to be:
It looks like that manual has changed since you wrote this post! I can't see the upgrade link on the page anymore:
It looks like the "Upgrade" link below "Installation" and above "File Locations" appears to no longer there:
Yes, it was removed as it contained just a sentence pointing to the real upgrade section, which can be easily found from the navigation.