improve early data comments

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 900ed00..df10cc6 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -3206,10 +3206,10 @@
 /* RFC 8446 section 4.2.10
  *
  * struct {
- *   select ( Handshake.msg_type ) {
- *     case new_session_ticket:   uint32 max_early_data_size;
- *     ...
- *   };
+ *     select (Handshake.msg_type) {
+ *         case new_session_ticket:   uint32 max_early_data_size;
+ *         ...
+ *     };
  * } EarlyDataIndication;
  */
 MBEDTLS_CHECK_RETURN_CRITICAL