Updated help message for long_query_time

mysql-test/r/mysqld--help.result

@@ -418,8 +418,9 @@ The following options may be given as the first argument:
  file.Value can be between 0 and 11. Higher values mean
  more verbosity
  --long-query-time=# Log all queries that have taken more than long_query_time
- seconds to execute to file. The argument will be treated
- as a decimal value with microsecond precision
+ seconds to execute to the slow query log file. The
+ argument will be treated as a decimal value with
+ microsecond precision
  --low-priority-updates 
  INSERT/DELETE/UPDATE has lower priority than selects
  --lower-case-table-names[=#] 

mysql-test/suite/sys_vars/r/sysvars_server_embedded.result

@@ -1794,7 +1794,7 @@ GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	10.000000
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	DOUBLE
-VARIABLE_COMMENT	Log all queries that have taken more than long_query_time seconds to execute to file. The argument will be treated as a decimal value with microsecond precision
+VARIABLE_COMMENT	Log all queries that have taken more than long_query_time seconds to execute to the slow query log file. The argument will be treated as a decimal value with microsecond precision
 NUMERIC_MIN_VALUE	0
 NUMERIC_MAX_VALUE	31536000
 NUMERIC_BLOCK_SIZE	NULL

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -1962,7 +1962,7 @@ GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	10.000000
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	DOUBLE
-VARIABLE_COMMENT	Log all queries that have taken more than long_query_time seconds to execute to file. The argument will be treated as a decimal value with microsecond precision
+VARIABLE_COMMENT	Log all queries that have taken more than long_query_time seconds to execute to the slow query log file. The argument will be treated as a decimal value with microsecond precision
 NUMERIC_MIN_VALUE	0
 NUMERIC_MAX_VALUE	31536000
 NUMERIC_BLOCK_SIZE	NULL

sql/sys_vars.cc

@@ -1255,8 +1255,8 @@ static bool update_cached_long_query_time(sys_var *self, THD *thd,
 static Sys_var_double Sys_long_query_time(
        "long_query_time",
        "Log all queries that have taken more than long_query_time seconds "
-       "to execute to file. The argument will be treated as a decimal value "
-       "with microsecond precision",
+       "to execute to the slow query log file. The argument will be treated "
+       "as a decimal value with microsecond precision",
        SESSION_VAR(long_query_time_double),
        CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, LONG_TIMEOUT), DEFAULT(10),
        NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),