MINOR: Fix typo
Reviewers: Guozhang Wang
<li>Fully integrated with Kafka security</li>
<li>Write standard Java applications</li>
<li>Exactly-once processing semantics</li>
- <li>No seperate processing cluster required</li>
+ <li>No separate processing cluster required</li>
<li>Develop on Mac, Linux, Windows</li>
</ul>
