Fixed Typo at enabling-chinese-japanese-korean-search.rst

[jaehyun-ko]

Description

This pull request addresses a documentation error regarding the configuration variable for InnoDB full-text search in MySQL 5.7. The current documentation incorrectly references innodb_ft_min_word_len, which does not exist in MySQL 5.7. The correct variable name is innodb_ft_min_token_size.

Changes

Updated the documentation to replace innodb_ft_min_word_len with innodb_ft_min_token_size.

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[cwarnermm]

Thank you, @jaehyun-ko!