Attio: document support for new batching mode

Author: Nick Campbell

src/connections/destinations/catalog/actions-attio/index.md

@@ -155,6 +155,24 @@ domains matches the one you've provided here. If it finds it, it will update the
 attribute with the value `"@attio"`. If it doesn't find it, a new Company will be created
 with both the domain and twitter handles above.
 
+## Batching support
+
+This action supports batching, which can be toggled using the "Enable Batching" property
+on the **Edit Mapping** page. Batching will send groups of events to Attio in a single
+request, rather than individually, which can improve stability & correctness if you are
+sending a lot of events.
+
+However, there are a couple of caveats to be aware of:
+
+  1. Attio will process these events asynchronously, which means it might take a few
+     seconds between Attio acknowledging the request and the record updates appearing in
+     your Attio workspace.
+
+  2. Invalid events will be silently dropped. This can happen if your mapping
+     configuration points to a non-existent Attio attribute, or you're trying to write the
+     wrong attribute type (e.g. writing a number to a domain attribute). We recommend you
+     continue to use the **Send test event** feature on the mapping page to check
+     configurations before saving them.
 
 ## Attribute types