Do not misspell "fall through"

sql/sql_trigger.cc

@@ -1595,7 +1595,7 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
       thd->spcont= save_spcont;
       thd->variables.sql_mode= save_sql_mode;
       thd->reset_db(save_db.str, save_db.length);
-      /* Fall trough to error */
+      /* Fall through to error */
     }
   }
 

sql/table.cc

@@ -7419,7 +7419,6 @@ int TABLE::update_virtual_fields(handler *h, enum_vcol_update_mode update_mode)
       swap_values= 1;
       break;
     case VCOL_UPDATE_FOR_DELETE:
-      /* Fall trough */
     case VCOL_UPDATE_FOR_WRITE:
       update= bitmap_is_set(vcol_set, vf->field_index);
       break;