## What changes were proposed in this pull request?
This patch uses `{% highlight lang %}...{% endhighlight %}` to highlight code snippets in the `Structured Streaming Kafka010 integration doc` and the `Spark Streaming Kafka010 integration doc`.
This patch consists of two commits:
- the first commit fixes only the leading spaces -- this is large
- the second commit adds the highlight instructions -- this is much simpler and easier to review
## How was this patch tested?
SKIP_API=1 jekyll build
## Screenshots
**Before**
**After**
Author: Liwei Lin <lwlin7@gmail.com>
Closes#15715 from lw-lin/doc-highlight-code-snippet.
## What changes were proposed in this pull request?
Minor doc change to mention kafka configuration for larger spark batches.
## How was this patch tested?
Doc change only, confirmed via jekyll.
The configuration issue was discussed / confirmed with users on the mailing list.
Author: cody koeninger <cody@koeninger.org>
Closes#15570 from koeninger/kafka-doc-heartbeat.
## What changes were proposed in this pull request?
Documentation fix to make it clear that reusing group id for different streams is super duper bad, just like it is with the underlying Kafka consumer.
## How was this patch tested?
I built jekyll doc and made sure it looked ok.
Author: cody koeninger <cody@koeninger.org>
Closes#15442 from koeninger/SPARK-17853.
## What changes were proposed in this pull request?
Doc for the Kafka 0.10 integration
## How was this patch tested?
Scala code examples were taken from my example repo, so hopefully they compile.
Author: cody koeninger <cody@koeninger.org>
Closes#14385 from koeninger/SPARK-16312.
