fix typo

Signed-off-by: lilinjie <1136268146@qq.com>

sql/log.cc

@@ -408,7 +408,7 @@ class binlog_cache_data
   Rows_log_event *m_pending;
 
   /*
-    Bit flags for what has been writting to cache. Used to
+    Bit flags for what has been writing to cache. Used to
     discard logs without any data changes.
     see enum_logged_status;
   */

sql/log_event.h

@@ -726,7 +726,7 @@ enum Log_event_type
 
 
 /*
-  Bit flags for what has been writting to cache. Used to
+  Bit flags for what has been writing to cache. Used to
   discard logs with table map events but not row events and
   nothing else important. This is stored by cache.
 */