Merge pull request #6964 from segmentio/vanand17-patch-12

Add details about content_id mapping

Author: forstisabella

src/connections/destinations/catalog/facebook-pixel/index.md

@@ -193,6 +193,8 @@ If you're using real estate, travel, or automotive [Dynamic Ads](https://www.fac
 
 For most implementations, Segment recommends leaving these mappings blank. By default, Segment sets `content_type` to "product".
 
+The same mapping can be used to change the `content_id` from the default value (product_id or the sku) to anything specific for Meta Pixel. For more information about required Meta Pixel events, see Meta's [Required Meta Pixel events and parameters for Advantage+ catalog ads](https://www.facebook.com/business/help/606577526529702?id=1205376682832142){:target="_blank”} documentation.
+
 ## Troubleshooting
 
 ### PII blocklisting