Adds new links to Troubleshoot > Security (#482)

Adds links to two new troubleshooting pages.

Preview:
[Security](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/482/troubleshoot/security)

Author: natasha-moore-elastic

troubleshoot/security.md

@@ -10,4 +10,5 @@ This section covers common {{elastic-sec}} related issues and how to resolve the
 
 * [Troubleshoot detection rules](security/detection-rules.md)
 * [Troubleshoot {{elastic-defend}}](security/elastic-defend.md)
-
+* [Troubleshoot indicators of compromise](security/indicators-of-compromise.md)
+* [Agentless integrations FAQ](security/agentless-integrations.md)