I believe there is a bug in the documentation on:
nextView and prevView should be next_view and prev_view, respectively.
I ran into this when setting up the following user-specific key bindings on OS X (which I think would make nice defaults!):
{
"keys": "ctrl+pageup"],
"command": "prev_view"
},
{
"keys": "ctrl+pagedown"],
"command": "next_view"
}
]