Merge pull request #1677 from vespa-engine/kkraune/link

link update

Author: radu-gheorghe

examples/part-purchases-demo/README.md

@@ -95,12 +95,12 @@ You'll need to [install Logstash](https://www.elastic.co/downloads/logstash), th
 bin/logstash-plugin install logstash-output-vespa_feed
 ```
 
-2. Adapt [this logstash.conf](https://github.com/vespaai/university/blob/main/101/ch3/logstash.conf) to point to the absolute path of [purchase.csv](ext/purchase.csv).
+2. Adapt [this logstash.conf](https://github.com/vespaai/university/blob/main/101/ch5/logstash.conf) to point to the absolute path of [purchase.csv](ext/purchase.csv).
 
 3. Run Logstash with the modified `logstash.conf`:
 
 ```
 bin/logstash -f $PATH_TO_LOGSTASH_CONF/logstash.conf
 ```
 
-For more examples of using Logstash with Vespa, check out [this tutorial blog post](https://blog.vespa.ai/logstash-vespa-tutorials/).
+For more examples of using Logstash with Vespa, check out [this tutorial blog post](https://blog.vespa.ai/logstash-vespa-tutorials/).