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update docs/zh/base/parts/base-mapper-delete-methods.md.

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Signed-off-by: 王超 <920806536@qq.com>
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docs/zh/base/parts/base-mapper-delete-methods.md
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- **`deleteById(id)`**：根据主键删除数据。如果是多个主键的情况下，需要传入数组，例如：`new Integer[]{100,101}`。
- **`delete(entity)`**：根据实体主键来删除数据。相比deleteById(id)，此方法更便于对多主键实体类的删除。
- **`deleteBatchByIds(ids)`**：根据多个主键批量删除数据。
- **`deleteBatchByIds(ids, size)`**：根据多个主键批量删除数据。
- **`deleteByMap(whereConditions)`**：根据 Map 构建的条件来删除数据。