Fix example for policy runbook (#224)

Author: airadier

website/docs/r/secure_policy.md

@@ -20,7 +20,7 @@ resource "sysdig_secure_policy" "write_apt_database" {
   description = "an attempt to write to the dpkg database by any non-dpkg related program"
   severity = 4
   enabled = true
-  runbook = "https://runbook.com
+  runbook = "https://runbook.com"
   
   // Scope selection
   scope = "container.id != \"\""