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Update MySQL.md

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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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co-authored by Claude Fable 5
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@@ -163,7 +163,7 @@ customer_id_selectivity: 0.0373
#### 4. 前缀索引
对于 BLOB、TEXT 和 VARCHAR 类型的列，必须使用前缀索引，只索引开始的部分字符。
对于 BLOB 和 TEXT 类型的列，必须使用前缀索引，只索引开始的部分字符；对于 VARCHAR 和 CHAR 类型的列，可以选择使用前缀索引来减小索引的大小。
前缀长度的选取需要根据索引选择性来确定。