Update doc

docs/guides/nrfconnect_examples_configuration.md

@@ -193,6 +193,15 @@ instead of using a QR code, which is the default configuration.
 To enable NFC for commissioning and share the onboarding payload in an NFC tag,
 set the `CONFIG_CHIP_NFC_COMMISSIONING` option.
 
+**Factory reset behavior**
+
+By default, the factory reset procedure implemented in the Matter stack removes
+Matter-related settings only. If your application does not depend on any
+device-lifelong data stored in the non-volatile storage, set the
+`CONFIG_CHIP_FACTORY_RESET_ERASE_NVS` option to fully erase the NVS partition at
+the factory reset. This approach is more robust and regains the original NVS
+performance in case it has been polluted with unwanted entries.
+
 **Logging**
 
 You can enable logging for both the stack and Zephyr’s