curl_sasl.c: Small code tidy up following imap changes

lib/curl_sasl.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012-2013, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -19,6 +19,7 @@
  * KIND, either express or implied.
  *
  * RFC2195 CRAM-MD5 authentication
+ * RFC2222 Simple Authentication and Security Layer (SASL)
  * RFC2831 DIGEST-MD5 authentication
  * RFC4616 PLAIN authentication
  *