samples: bluetooth: ancs_client: Align to LE Secure Connection

ANCS sample does not enable LE legacy pairing by default. Therefore,
nRF Connect for Desktop should enable LE Secure Connection pairing.

Ref: NCSDK-32197

Signed-off-by: Bernard Lee <[email protected]>

Author: leewkb4567

samples/bluetooth/peripheral_ancs_client/README.rst

@@ -124,7 +124,7 @@ Testing with Bluetooth Low Energy app
 #. Click :guilabel:`Apply to device`.
 #. Click the :guilabel:`CONNECTION MAP` tab.
    Click the dongle configuration and select :guilabel:`Security parameters`.
-   Check :guilabel:`Perform Bonding`, and click :guilabel:`Apply`.
+   Check :guilabel:`Perform Bonding` and :guilabel:`Enable LE Secure Connection pairing`, and click :guilabel:`Apply`.
 #. Connect to the device from the app.
    The device is advertising as "ANCS".
 #. Wait until the bond is established. Verify that the UART data is received as follows::