[doc] fix typo
[doc] fix typo

Change-Id: Ia8cfc29fe166e53fe6e7d802a98d2d1d9ec1bf30
Reviewed-on: https://review.streamsets.net/2103
Reviewed-by: Loretta Chen <86cbbfa5f4e2ea880344e8bdec2e584c20d686d8@streamsets.com>

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