Implement the missing pjsua_get_snd_dev() function

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@925 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/include/pjsua-lib/pjsua.h b/pjsip/include/pjsua-lib/pjsua.h
index 36368bb..fd5df19 100644
--- a/pjsip/include/pjsua-lib/pjsua.h
+++ b/pjsip/include/pjsua-lib/pjsua.h
@@ -4074,7 +4074,7 @@
  * @return		PJ_SUCCESS on success, or the appropriate error code.
  *
  * \par Python:
- * The function takes no argument and return a tuple:
+ * The function takes no argument and return an (integer,integer) tuple:
  * \code
     capture_dev, playback_dev = py_pjsua.get_snd_dev()
  * \endcode