This should be the same as the Help feature in the app. After tapping help in the (...) menu at the top right in the app, tap the icon at the top left in the Help pop-up to see the table of contents.
Apple used to provide a PDF version, but I don't think they do that now.
I just checked the iBooks store and there is a Pages User Guide that looks to be current. I don't know if the info is that different, but it might be easier to read.