Add remark about getting the thumbprint using a different algorithm

Author: vcsjones

xml/System.Security.Cryptography.X509Certificates/X509Certificate2.xml

@@ -3650,7 +3650,9 @@ Unlike <xref:System.Security.Cryptography.X509Certificates.X509Certificate2.RawD
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The thumbprint is dynamically generated using the SHA1 algorithm and does not physically exist in the certificate. Since the thumbprint is a unique value for the certificate, it is commonly used to find a particular certificate in a certificate store.  
+ The thumbprint is dynamically generated using the SHA-1 algorithm and does not physically exist in the certificate. Since the thumbprint is a unique value for the certificate, it is commonly used to find a particular certificate in a certificate store.  
+
+ This property always use the SHA-1 hash algorithm to compute the hash. To get the thumbprint using a different hash algorithm, use <xref:System.Security.Cryptography.X509Certificates.X509Certificate.GetCertHashString(System.Security.Cryptography.HashAlgorithmName)>.