Instead of `client.client`, the client object is now referred to as `client.object` and the client class as `client.class`. This moves the documentation of `client.focus` to the class. Closes https://github.com/awesomeWM/awesome/pull/349.
v2: Add available signals to the docs. Signed-off-by: Julian Wollrath <jwollrath@web.de>
Signed-off-b: Julian Wollrath <jwollrath@web.de>