lightning: add a note for using separator

[pepezzzz]

how to handle encode kv error

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[Oreoxmt]

Suggested change

	> 如果 CSV 格式配置错误，TiDB Lightning 错误退出并提示 `encode kv error in file db.table.serialno.csv:0 at offset 2529671`。用 vim 打开 csv 文件，命令模式下 `:goto 2529671` 可以定位到编码错误的位置。
	> 如果 CSV 格式配置错误，TiDB Lightning 将退出并显示错误消息 `encode kv error in file db.table.serialno.csv:0 at offset 2529671`。要定位错误，你可以使用 vim 打开 CSV 文件，并在命令模式下输入 `:goto 2529671`。更多信息，请参考[错误报告](/tidb-lightning/tidb-lightning-error-resolution.md#错误报告)。

[Oreoxmt]

Suggested change

	* "\u0001" 表示使用 ASCII 字符 0x01，即 SOH 控制字符，常用于 HIVE 表的导出时的分隔符。
	* "\u0001" 表示使用 ASCII 字符 0x01，即 SOH 控制字符，常用于导出 Hive 数据。