MINOR: fix typos on web doc's upgrade guide
Author: Matthias J. Sax
Reviewers: Guozhang Wang
Closes from mjsax/hotfix
<p>
With 1.0 a major API refactoring was accomplished and the new API is cleaner and easier to use.
- This change includes the five main classes <code>KafakStreams<code>, <code>KStreamBuilder</code>,
+ This change includes the five main classes <code>KafkaStreams<code>, <code>KStreamBuilder</code>,
<code>KStream</code>, <code>KTable</code>, and <code>TopologyBuilder</code> (and some more others).
All changes are fully backward compatible as old API is only deprecated but not removed.
We recommend to move to the new API as soon as you can.
The new classes have basically the same methods as the old ones to build a topology via DSL or Processor API.
However, some internal methods that were public in <code>KStreamBuilder</code>
and <code>TopologyBuilder</code> but not part of the actual API are not present
- in the new classe any longer.
+ in the new classes any longer.
Furthermore, some overloads were simplified compared to the original classes.
See <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-120%3A+Cleanup+Kafka+Streams+builder+API">KIP-120</a>
and <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-182%3A+Reduce+Streams+DSL+overloads+and+allow+easier+use+of+custom+storage+engines">KIP-182</a>
