Merge pull request #236 from Yubico/docs-issue-234

docs: Corrected docs on attestation statement

Author: DennisDyallo

docs/users-manual/application-piv/slots.md

@@ -64,21 +64,16 @@ keys.
 
 ## Attestation Key
 
-The attestation key (in slot `F9`) will be used to create an attestation statement (which
-is an X.509 certificate) that attests a key in slot `9A`, `9C`, `9D`, or `9E` was
-generated on the YubiKey.
-
-Upon manufacture, a private key and cert pair is loaded into slot `F9`. This key is
-generated by Yubico, the cert is signed by a Yubico CA and chains to a Yubico root. The
-same key and cert are loaded onto many different YubiKeys. See the article on
-[PIV attestation](attestation.md) for more information on this topic.
-
-Note that if a private key was imported into one of those slots, it will not be possible
-to create an attestation statement for that slot.
-
-It is possible to have the YubiKey generate a key pair for one of the retired slots
-(`82` - `95`). However, the attestation key will not generate an attestation statement for
-a key in one of those slots, even if it was generated by the YubiKey.
+The attestation key (in slot `F9`) is used to create an attestation statement (an X.509 
+certificate), which attests that a key in slot `9A`, `9C`, `9D`, `9E`, or one of the 
+retired slots (`82` - `95`) was *generated* on the YubiKey. If a private key was *imported* 
+into one of those slots, it will not be possible to create an attestation statement for 
+that slot. 
+
+Upon manufacture, the attestation key (a private key and certificate pair) is loaded into slot
+ `F9`. This key is generated by Yubico, and the cert is signed by a Yubico CA and chains 
+to a Yubico root. The same key and cert are loaded onto many different YubiKeys. See the 
+article on [PIV attestation](attestation.md) for more information on this topic.
 
 ## Generate and import asymmetric keys