docs fix posthog

Author: ishaan-jaff

docs/my-website/docs/proxy/config_settings.md

@@ -690,6 +690,8 @@ router_settings:
 | PILLAR_API_KEY | API key for Pillar API Guardrails
 | PILLAR_ON_FLAGGED_ACTION | Action to take when content is flagged ('block' or 'monitor')
 | POD_NAME | Pod name for the server, this will be [emitted to `datadog` logs](https://docs.litellm.ai/docs/proxy/logging#datadog) as `POD_NAME` 
+| POSTHOG_API_KEY | API key for PostHog analytics integration
+| POSTHOG_API_URL | Base URL for PostHog API (defaults to https://us.i.posthog.com)
 | PREDIBASE_API_BASE | Base URL for Predibase API
 | PRESIDIO_ANALYZER_API_BASE | Base URL for Presidio Analyzer service
 | PRESIDIO_ANONYMIZER_API_BASE | Base URL for Presidio Anonymizer service