[meta] format README

README.md

@@ -2,26 +2,40 @@
 
 [![Build Status](https://img.shields.io/jenkins/s/https/devops-ci.elastic.co/job/elastic+helm-charts+master.svg)](https://devops-ci.elastic.co/job/elastic+helm-charts+master/)
 
-This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.
+This functionality is in beta and is subject to change. The design and code is
+less mature than official GA features and is being provided as-is with no
+warranties. Beta features are not subject to the support SLA of official GA
+features.
 
 ## Charts
 
-Please look in the chart directories for the documentation for each chart. These helm charts are designed to be a lightweight way to configure our official docker images. Links to the relevant docker image documentation has also been added below.
+Please look in the chart directories for the documentation for each chart. These
+Helm charts are designed to be a lightweight way to configure our official
+Docker images. Links to the relevant Docker image documentation has also been
+added below.
 
 | Chart                                      | Docker documentation                                                            |
-| ------------------------------------------ | ------------------------------------------------------------------------------- |
+|--------------------------------------------|---------------------------------------------------------------------------------|
+| [APM-Server](./apm-server/README.md)       | https://www.elastic.co/guide/en/apm/server/current/running-on-docker.html       |
 | [Elasticsearch](./elasticsearch/README.md) | https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html     |
+| [Filebeat](./filebeat/README.md)           | https://www.elastic.co/guide/en/beats/filebeat/current/running-on-docker.html   |
 | [Kibana](./kibana/README.md)               | https://www.elastic.co/guide/en/kibana/current/docker.html                      |
 | [Logstash](./logstash/README.md)           | https://www.elastic.co/guide/en/logstash/current/docker.html                    |
-| [Filebeat](./filebeat/README.md)           | https://www.elastic.co/guide/en/beats/filebeat/current/running-on-docker.html   |
 | [Metricbeat](./metricbeat/README.md)       | https://www.elastic.co/guide/en/beats/metricbeat/current/running-on-docker.html |
-| [APM-Server](./apm-server/README.md)       | https://www.elastic.co/guide/en/apm/server/current/running-on-docker.html       |
 
 ## Kubernetes Versions
 
-The charts are [currently tested](https://devops-ci.elastic.co/job/elastic+helm-charts+master/) against all GKE versions available. The exact versions are defined under `KUBERNETES_VERSIONS` in [helpers/matrix.yml](/helpers/matrix.yml)
+The charts are [currently tested][] against all GKE versions available. The
+exact versions are defined under `KUBERNETES_VERSIONS` in
+[helpers/matrix.yml][].
 
 ## Helm versions
 
-While we are checking backward compatibility, the charts are only tested with Helm version mentioned in [helm-tester Dockerfile](helpers/helm-tester/Dockerfile) (currently 2.16.6).
-Note that we don't support [Helm 3](https://v3.helm.sh/) version.
+While we are checking backward compatibility, the charts are only tested with
+Helm version mentioned in [helm-tester Dockerfile][] (currently 2.16.6).
+Note that we don't support [Helm 3][] version.
+
+[currently tested]: https://devops-ci.elastic.co/job/elastic+helm-charts+master/
+[helm 3]: https://v3.helm.sh
+[helm-tester Dockerfile]: https://github.com/elastic/helm-charts/blob/master/helpers/helm-tester/Dockerfile
+[helpers/matrix.yml]: https://github.com/elastic/helm-charts/blob/master/helpers/matrix.yml