Improve documentation for pairing a new client

[krautsource]

Hi,

after spending way too much time trying to start pairing mode on my Smart Home Controller II, I'd like to suggest a change to the documentation.

Currently, it reads:

Hint: Before submitting the New Client request, always press the Bosch Smart Home Controller's front-side button, until the LEDs begin flashing.

I took the "press .. until" part literally and pressed (and held) the button until something started flashing, and that was the "cloud" LED.
Client registration didn't work of course, but I had no idea what the problem was. It took me longer than I care to admit until I finally tried a short button press on the controller.

Thus, I suggest changing the above sentence to something like:

Hint: Before submitting the New Client request, do a short press on the Bosch Smart Home Controller's front-side button. Both the "network" and "cloud" LEDs should be flashing yellow now, indicating pairing mode.

I don't know if this is true for both versions of the controller (I and II), so I haven't created a pull request yet.
Can someone else chime in?

[hxmelab]

The pairing mode is indeed different for the SHC gen. 1 and 2.
The documentation only describes it for gen 1 and should be updated to cover also the pairing of the 2nd gen.