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Update mongodbwriter.md

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mongodbwriter/doc/mongodbwriter.md
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@ -139,7 +139,7 @@ MongoDBWriter通过Datax框架获取Reader生成的数据，然后将Datax支持
* splitter：特殊分隔符，当且仅当要处理的字符串要用分隔符分隔为字符数组时，才使用这个参数，通过这个参数指定的分隔符，将字符串分隔存储到MongoDB的数组中。【选填】
* upsertInfo：指定了传输数据时更新的信息。【选填】
* isUpsert：当设置为true时，表示针对相同的upsertKey做更新操作。【选填】
* upsertKey：upsertKey指定了没行记录的业务主键。用来做更新时使用。【选填】
* upsertKey：upsertKey指定了每行记录的业务主键。用来做更新时使用。【选填】
#### 5 类型转换