innobase/include/rem0rec.ic:
  Improve formatting of comments
innobase/include/trx0trx.h:
  dict_operation: document the effect of setting the flag
innobase/row/row0mysql.c:
  Do not set the dict_operation flag. (Bug #8144)
  Allow MySQL to have open handles to the table being truncated.
sql/ha_innodb.cc:
  store_lock(): Do not weaken TL_WRITE locks taken by TRUNCATE TABLE.