Add crosslinks to troubleshooting (#1588)

* Add crosslinks to troubleshooting * Update docs/reference/index.md Co-authored-by: Visha Angelova <91186315+vishaangelova@users.noreply.github.com> --------- Co-authored-by: Visha Angelova <91186315+vishaangelova@users.noreply.github.com>

Author: theletterf

docs/reference/index.md

@@ -28,3 +28,6 @@ These events, called Transactions and Spans, are sent to the APM Server. The APM
 
 APM Agents work in conjunction with the [APM Server](docs-content://solutions/observability/apps/application-performance-monitoring-apm.md), [Elasticsearch](docs-content://get-started/index.md), and [Kibana](docs-content://get-started/the-stack.md). The [APM Guide](docs-content://solutions/observability/apps/application-performance-monitoring-apm.md) provides details on how these components work together, and provides a matrix outlining [Agent and Server compatibility](docs-content://solutions/observability/apps/apm-agent-compatibility.md).
 
+## Troubleshooting
+
+If you're experiencing issues with the APM Ruby agent, refer to [Troubleshoot APM Ruby Agent](docs-content://troubleshoot/observability/apm-agent-ruby/apm-ruby-agent.md).

docs/reference/toc.yml

@@ -19,4 +19,6 @@ toc:
  # TO DO: Not available on master
  # - file: log-correlation.md
  - file: performance-tuning.md
- - file: upgrading.md
+ - file: upgrading.md
+ - title: Troubleshooting
+ crosslink: docs-content://troubleshoot/observability/apm-agent-ruby/apm-ruby-agent.md