Typo in iproto > Keys used in requests and responses

> <…>ERT,
> IPROTO_REPLACE,
> IPROTO_UPSERT
> Tuple to be inserted
> 
> **IPROTO_|UPSERT|**
> Operations to perform
> 
> IPROTO_AUTH
> Array of 2 fields:
> authentic<…>

https://www.tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#internals-iproto-keys-tuple

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