add extra supported boards lines

As requested by Eirik.

Signed-off-by: Grzegorz Ferenc <[email protected]>

doc/docs/index.md

@@ -10,7 +10,7 @@ The {{app_name}} is installed and updated using [nRF Connect for Desktop](https:
 
 The {{app_name}} supports the following Power Management IC devices from Nordic Semiconductor:
 
--   nPM2100 Evaluation Kit (EK) - Supported for the limited customer sampling.
+-   nPM2100 Evaluation Kit (EK) - Supported for a limited customer sampling. [Contact Nordic Semiconductor](https://www.nordicsemi.com/About-us/Contact-Us) if you want to have access to the Evaluation Kit and the experimental version of the {{app_name}}.
 -   [nPM1300 Evaluation Kit (EK)](https://docs.nordicsemi.com/bundle/ug_npm1300_ek/page/UG/nPM1300_EK/intro.html) - Read [Connect the nPM1300 EK with nPM PowerUP](https://docs.nordicsemi.com/bundle/ug_npm1300_ek/page/UG/nPM1300_EK/use_ek_power_up.html) for information about the hardware setup required to use the nPM1300 EK with nPM PowerUP.
 -   [nPM Fuel Gauge Board](https://docs.nordicsemi.com/bundle/ug_npm_fuel_gauge/page/UG/nPM_fuel_gauge/intro.html) - Read [Connect the nPM1300 EK with the nPM Fuel Gauge Board](https://docs.nordicsemi.com/bundle/nan_045/page/APP/nan_045/battery_profiling.html) for information about the hardware setup required to use the nPM1300 Fuel Gauge Board together with nPM1300 EK and nPM PowerUP.