[FLINK-7382] [docs] Broken links in Apache Flink Documentation page

This closes apache#4490.

docs/examples/index.md

@@ -31,7 +31,7 @@ under the License.
 
 [Building real-time dashboard applications with Apache Flink, Elasticsearch, and Kibana](https://www.elastic.co/blog/building-real-time-dashboard-applications-with-apache-flink-elasticsearch-and-kibana) is a blog post at elastic.co showing how to build a real-time dashboard solution for streaming data analytics using Apache Flink, Elasticsearch, and Kibana.
 
-The [Flink training website](http://dataartisans.github.io/flink-training) from data Artisans has a number of examples. See the hands-on sections, and the exercises.
+The [Flink training website](http://training.data-artisans.com/) from data Artisans has a number of examples. See the hands-on sections, and the exercises.
 
 ## Bundled Examples
 

docs/index.md

@@ -51,9 +51,9 @@ For users that plan to upgrade a Flink system in production, we recommend readin
 
 ## External Resources
 
-- **Flink Forward**: Talks from past conferences are available at the [Flink Forward](http://flink-forward.org/) website and on [YouTube](https://www.youtube.com/channel/UCY8_lgiZLZErZPF47a2hXMA). [Robust Stream Processing with Apache Flink](http://berlin.flink-forward.org/kb_sessions/robust-stream-processing-with-apache-flink/) is a good place to start.
+- **Flink Forward**: Talks from past conferences are available at the [Flink Forward](http://flink-forward.org/) website and on [YouTube](https://www.youtube.com/channel/UCY8_lgiZLZErZPF47a2hXMA). [Robust Stream Processing with Apache Flink](http://2016.flink-forward.org/kb_sessions/robust-stream-processing-with-apache-flink/) is a good place to start.
 
-- **Training**: The [training materials](http://dataartisans.github.io/flink-training/) from data Artisans include slides, exercises, and sample solutions.
+- **Training**: The [training materials](http://training.data-artisans.com/) from data Artisans include slides, exercises, and sample solutions.
 
 - **Blogs**: The [Apache Flink](https://flink.apache.org/blog/) and [data Artisans](https://data-artisans.com/blog/) blogs publish frequent,
 in-depth technical articles about Flink.