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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• [ ] v9.0 (TiDB 9.0 versions)
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• [ ] v8.4 (TiDB 8.4 versions)
• [ ] v8.3 (TiDB 8.3 versions)
• [ ] v8.1 (TiDB 8.1 versions)
• [ ] v7.5 (TiDB 7.5 versions)
• [ ] v7.1 (TiDB 7.1 versions)
• [ ] v6.5 (TiDB 6.5 versions)
• [ ] v6.1 (TiDB 6.1 versions)
• [ ] v5.4 (TiDB 5.4 versions)

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• [ ] Delete files
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