Fix link to Cycle Analytics in help

The link to "GitLab Cycle Analytics" pointed to
/user/project/cycle_analytics.md and not /help/user/project/cycle_analytics.md.
This is caused by an issue with the markdown renderer. This temporary fix
corrects the link by inserting a line break.

doc/README.md

@@ -177,7 +177,8 @@ instant how code changes impact your production environment.
 - [Prometheus metrics](user/project/integrations/prometheus_library/metrics.md): Let Prometheus collect metrics from various services, like Kubernetes, NGINX, NGINX ingress controller, HAProxy, and Amazon Cloud Watch.
 - [GitLab Performance Monitoring](administration/monitoring/performance/index.md): Use InfluxDB and Grafana to monitor the performance of your GitLab instance (will be eventually replaced by Prometheus).
 - [Health check](user/admin_area/monitoring/health_check.md): GitLab provides liveness and readiness probes to indicate service health and reachability to required services.
-- [GitLab Cycle Analytics](user/project/cycle_analytics.md): Cycle Analytics measures the time it takes to go from an [idea to production](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/#from-idea-to-production-with-gitlab) for each project you have.
+- [GitLab Cycle Analytics](user/project/cycle_analytics.md): Cycle Analytics measures the time it takes to go from an
+  [idea to production](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/#from-idea-to-production-with-gitlab) for each project you have.
 
 ## Getting started with GitLab