Add ZeroFox to beta article

Author: jpipkin1

docs/platform-services/threat-intelligence-indicators.md

@@ -44,6 +44,7 @@ To search logs that contain correlations to threat intelligence indicators, you
    * [Mandiant Threat Intel Source](/docs/send-data/hosted-collectors/cloud-to-cloud-integration-framework/mandiant-threat-intel-source)
    * [STIX/TAXII 1 Client Source](/docs/send-data/hosted-collectors/cloud-to-cloud-integration-framework/stix-taxii-1-client-source)  
    * [STIX/TAXII 2 Client Source](/docs/send-data/hosted-collectors/cloud-to-cloud-integration-framework/stix-taxii-2-client-source)
+   * [ZeroFox Threat Intel Source](/docs/send-data/hosted-collectors/cloud-to-cloud-integration-framework/zerofox-intel-source)
 * **The API**. See the following APIs in the [Threat Intel Ingest Management](https://api.sumologic.com/docs/#tag/threatIntelIngest) API resource:
    * [uploadNormalizedIndicators API](https://api.sumologic.com/docs/#operation/uploadNormalizedIndicators)
    * [uploadCsvIndicators API](https://api.sumologic.com/docs/#operation/uploadCsvIndicators)