Merge pull request #233 from Yubico/docs-man-key

docs: Changed wording for default management key value and algorithm

Author: DennisDyallo

docs/users-manual/application-piv/pin-puk-mgmt-key.md

@@ -53,17 +53,16 @@ data is 192 bits long, but because of the "parity bits", only 168 bits supply th
 strength. In addition, because of certain attacks on Triple-DES, the actual effective bit
 strength of a key is 112.
 
-The YubiKey is manufactured with the standard default PIN, PUK, and managment key values:
+The YubiKey is manufactured with the following default PIN, PUK, and management key values:
 
 * PIN: "123456"
 * PUK: "12345678"
-* Management Key: (Firmware Version 5.6 and below: Triple-DES / 5.7 and above: AES-192),
-  0x010203040506070801020304050607080102030405060708\
-  0102030405060708 three times
+* Management Key: "010203040506070801020304050607080102030405060708"
 
-Note that the PIV standard specifies these default/initial values. For firmware 5.4 YubiKeys that allow AES, the default
-management key is Triple-DES. For firmware 5.7 and above
-YubiKeys, the default management key is AES-192.
+Note that the PIV standard specifies these default values. And while the management key value is 
+consistent across YubiKeys, the management key *algorithm* depends on a key's firmware version.
+For firmware 5.6 and earlier, the default management key algorithm is Triple-DES; for firmware 
+5.7 and later, the default algorithm is AES-192.
 
 Upon receipt of the YubiKey, it is a good idea to change the PIN, PUK, and management key from the default values. See
 [PivSession.TryChangePin](xref:Yubico.YubiKey.Piv.PivSession.TryChangePin%2a), [PivSession.TryChangePuk](xref:Yubico.YubiKey.Piv.PivSession.TryChangePuk),