Add note about 0 defaulting to lib default

Author: gdvalle

charts/lightstepsatellite/values.yaml

@@ -119,7 +119,7 @@ lightstep:
   collector_ingestion_tags:
   # -- Configure max gRPC receive message size in bytes.
   # https://pkg.go.dev/google.golang.org/grpc#MaxRecvMsgSize
-  # Defaults to the library default of 4MiB.
+  # Defaults to the library default of 4MiB if falsy.
   max_msg_size_bytes: 0
 
 # Recommended resources would be 2Gi memory and 2 cpu