Whoops!
I agree that missing documentation bits make a bad impression.
No need to report this one though, since it's already fixed. But, if you find any more errors in the doc-snapshot.qt-project.org domain, please do file a report at https://bugreports.qt-project.org -- Reports in this forum are hard for the developers to find, and will probably get buried under all the other posts.
Once Qt 5.1 is released (in a few weeks' time), the snapshots will become official documentation at qt-project.org/doc/qt-5.1/