add condition under which GA4 will silently drop event

Author: spencerattick

src/connections/destinations/catalog/actions-google-analytics-4/index.md

@@ -162,6 +162,7 @@ Google reserves certain event names, parameters, and user properties. Google sil
 - fields with `null` values
 - fields or events with reserved names
 - fields with a number as the key
+- fields or events with a dash (-) character in the name
 
 ### Verifying Event Meet GA4's Measurement Protocol API
 **Why are the events returning an error _Param [PARAM] has unsupported value._?**