Correct the name of the generated directory when using the maven archetype as described in the "Write a Streams Application" tutorial (#183)

In the streams tutorial, the code examples mixes `streams-quickstart` and `streams.examples`. I believe that they should all be `streams.examples`.

Affected version: 2.1._, 2.0._, 1.1._, 1.0._

Tested on mac os x v10.14.2, Java v1.8, Maven v3.5.4

Reviewers: Bill Bejeck <bbejeck@gmail.com>,  John Roesler <john@confluent.io>
4 files changed