add APM failed transaction rate rule

Author: mdbirnstiehl

raw-migrated-files/docs-content/serverless/observability-create-failed-transaction-rate-threshold-alert-rule.md

@@ -229,7 +229,6 @@ toc:
       - file: docs-content/serverless/observability-configure-intra-settings.md
       - file: docs-content/serverless/observability-correlate-application-logs.md
       - file: docs-content/serverless/observability-create-a-new-case.md
-      - file: docs-content/serverless/observability-create-failed-transaction-rate-threshold-alert-rule.md
       - file: docs-content/serverless/observability-create-latency-threshold-alert-rule.md
       - file: docs-content/serverless/observability-create-manage-rules.md
       - file: docs-content/serverless/observability-detect-metric-anomalies.md
@@ -482,7 +481,6 @@ toc:
       - file: observability-docs/observability/analyze-hosts.md
       - file: observability-docs/observability/apm-act-on-data.md
       - file: observability-docs/observability/apm-agents.md
-      - file: observability-docs/observability/apm-failed-transaction-rate-threshold-rule.md
       - file: observability-docs/observability/apm-getting-started-apm-server.md
       - file: observability-docs/observability/apm-latency-threshold-rule.md
       - file: observability-docs/observability/apm-traces.md