Update insert-functions.md

Updated Insert Functions documentation to reflect new support of multi-destination: https://segment.atlassian.net/browse/FUNK-1007

Author: longstoryshort

src/connections/functions/insert-functions.md

@@ -477,7 +477,7 @@ No, destination insert functions are currently available as cloud-mode destinati
 
 ##### Can I connect an insert function to multiple destinations?
 
-No, an insert function can only be connected to one destination.
+Yes, an insert function can be connected to multiple destinations. 
 
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