Update the default value of tidb_enable_column_tracking

[lilin90]

What is changed, added or deleted? (Required)

Updates the default value description for the tidb_enable_column_tracking variable.

Connected with driver mysql (8.0.11-TiDB-v8.5.1)
Type "help" for help.

my:[email protected]:4000=> SHOW VARIABLES LIKE 'tidb_enable_column_tracking';
        Variable_name        | Value
-----------------------------+-------
 tidb_enable_column_tracking | ON
(1 row)

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[lilin90]

@winoros Please check and confirm this change starts from which version. Thanks!