add cepstral legal goodies

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1916 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/asr_tts/mod_cepstral/mod_cepstral.c

@@ -28,8 +28,11 @@
  *
  * mod_cepstral.c -- Cepstral Interface
  * 
- * Some material based on the Cepstral Swift SDK, 
- * Copyiright Cepstral LLC and used by permission
+ * Contains some material derived from the Cepstral Swift SDK, by  
+ * permission.  You are free to copy and modify the source under the  
+ * terms of FreeSWITCH itself, without additional permission from  
+ * Cepstral
+ * 
  *
  */
 #ifdef __ICC