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I don't know about the website's documentation, but you can find the code for the python implementation of tf at https://github.com/ros/geometry/blob/indigo-devel/tf/src/tf/listener.py and it's easy enough to look for vector3.

Alternatively, if you open up a REPL, it's easy to see what functions are available. In ipython, start with by importing the listener: from tf import TransformListener. Then type TransformListener. (don't forget the trailing period) and hit tab. You'll get a list of all possible completions. Pick the one you want to know more about, and type help(TransformListener.transformVector3). Voila - there's your documentation.

I don't know about the website's documentation, but you can find the code for the python implementation of tf at https://github.com/ros/geometry/blob/indigo-devel/tf/src/tf/listener.py here, and it's easy enough to look for vector3.

Alternatively, if you open up a REPL, it's easy to see what functions are available. In ipython, start with by importing the listener: from tf import TransformListener. Then type TransformListener. (don't forget the trailing period) and hit tab. You'll get a list of all possible completions. Pick the one you want to know more about, and type help(TransformListener.transformVector3). Voila - there's your documentation.