email: Corrected references to SASL RFC

The most recent version of the SASL RFC is RFC4422 and not RFC2222 as
previously documented.

lib/imap.c

@@ -19,10 +19,10 @@
  * KIND, either express or implied.
  *
  * RFC2195 CRAM-MD5 authentication
- * RFC2222 Simple Authentication and Security Layer (SASL)
  * RFC2595 Using TLS with IMAP, POP3 and ACAP
  * RFC2831 DIGEST-MD5 authentication
  * RFC3501 IMAPv4 protocol
+ * RFC4422 Simple Authentication and Security Layer (SASL)
  * RFC4616 PLAIN authentication
  * RFC5092 IMAP URL Scheme
  *

lib/pop3.c

@@ -21,11 +21,11 @@
  * RFC1734 POP3 Authentication
  * RFC1939 POP3 protocol
  * RFC2195 CRAM-MD5 authentication
- * RFC2222 Simple Authentication and Security Layer (SASL)
  * RFC2384 POP URL Scheme
  * RFC2449 POP3 Extension Mechanism
  * RFC2595 Using TLS with IMAP, POP3 and ACAP
  * RFC2831 DIGEST-MD5 authentication
+ * RFC4422 Simple Authentication and Security Layer (SASL)
  * RFC4616 PLAIN authentication
  *
  ***************************************************************************/

lib/smtp.c

@@ -22,8 +22,8 @@
  * RFC3207 SMTP over TLS
  * RFC4954 SMTP Authentication
  * RFC2195 CRAM-MD5 authentication
- * RFC2222 Simple Authentication and Security Layer (SASL)
  * RFC2831 DIGEST-MD5 authentication
+ * RFC4422 Simple Authentication and Security Layer (SASL)
  * RFC4616 PLAIN authentication
  *
  ***************************************************************************/