Update 'pkcs15-tools.md'

pkcs15-tools.md

@@ -11,7 +11,27 @@ X.509 Certificate [Certificate for Card Authentication]
 ```
 
 ```shell
-pkcs15-tool --list-public-keys
+$ pkcs15-tool --list-public-keys
+Using reader with a card: Yubico YubiKey OTP+FIDO+CCID
+Public EC Key [PIV AUTH pubkey]
+	Object Flags   : [0x00]
+	Usage          : [0x40], verify
+	Access Flags   : [0x02], extract
+	FieldLength    : 384
+	Key ref        : 154 (0x9A)
+	Native         : yes
+	ID             : 01
+	DirectValue    : <absent>
+
+Public EC Key [SIGN pubkey]
+	Object Flags   : [0x00]
+	Usage          : [0x40], verify
+	Access Flags   : [0x02], extract
+	FieldLength    : 256
+	Key ref        : 156 (0x9C)
+	Native         : yes
+	ID             : 02
+	DirectValue    : <absent>
 ```
 
 ```shell