Removed "deprecated" warning from explicit_defaults_for_timestamp

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

@@ -242,7 +242,7 @@ The following options may be given as the first argument:
  This option causes CREATE TABLE to create all TIMESTAMP
  columns as NULL with DEFAULT NULL attribute, Without this
  option, TIMESTAMP columns are NOT NULL and have implicit
- DEFAULT clauses. The old behavior is deprecated.
+ DEFAULT clauses.
  --external-locking  Use system (external) locking (disabled by default). 
  With this option enabled you can run myisamchk to test
  (not repair) tables while the MySQL server is running.

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

@@ -899,7 +899,7 @@ GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	OFF
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BOOLEAN
-VARIABLE_COMMENT	This option causes CREATE TABLE to create all TIMESTAMP columns as NULL with DEFAULT NULL attribute, Without this option, TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses. The old behavior is deprecated.
+VARIABLE_COMMENT	This option causes CREATE TABLE to create all TIMESTAMP columns as NULL with DEFAULT NULL attribute, Without this option, TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

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

@@ -927,7 +927,7 @@ GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	OFF
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BOOLEAN
-VARIABLE_COMMENT	This option causes CREATE TABLE to create all TIMESTAMP columns as NULL with DEFAULT NULL attribute, Without this option, TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses. The old behavior is deprecated.
+VARIABLE_COMMENT	This option causes CREATE TABLE to create all TIMESTAMP columns as NULL with DEFAULT NULL attribute, Without this option, TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

sql/sys_vars.cc

@@ -573,8 +573,7 @@ static Sys_var_mybool Sys_explicit_defaults_for_timestamp(
        "explicit_defaults_for_timestamp",
        "This option causes CREATE TABLE to create all TIMESTAMP columns "
        "as NULL with DEFAULT NULL attribute, Without this option, "
-       "TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses. "
-       "The old behavior is deprecated.",
+       "TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses.",
        READ_ONLY GLOBAL_VAR(opt_explicit_defaults_for_timestamp),
        CMD_LINE(OPT_ARG), DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG);