Update concept-certificate-based-authentication-certificateuserids.md

Author: vimrang

articles/active-directory/authentication/concept-certificate-based-authentication-certificateuserids.md

@@ -19,7 +19,7 @@ ms.custom: has-adal-ref
 
 # Certificate user IDs 
 
-You can add certificate user IDs to users in Azure AD can have certificate user IDs. a multivalued attribute named **certificateUserIds**. The attribute allows up to four values, and each value can be of 120-character length. It can store any value, and doesn't require email ID format. It can store non-routable User Principal Names (UPNs) like _bob@woodgrove_ or _bob@local_.
+Azure AD has a multivalued attribute named **certificateUserIds** on the user object that can be used in Username bindings. The attribute allows up to four values, and each value can be of 120-character length. It can store any value, and doesn't require email ID format. It can store non-routable User Principal Names (UPNs) like _bob@woodgrove_ or _bob@local_.
 
 ## Supported patterns for certificate user IDs