Update lib/grpc/stream.ex

Co-authored-by: Paulo Valente <[email protected]>

Author: sleipnir

lib/grpc/stream.ex

@@ -120,7 +120,7 @@ defmodule GRPC.Stream do
     do: build_grpc_stream([input], Keyword.merge(opts, unary: true))
 
   @doc """
-  Extracts the internal `Flow` pipeline from a `GRPC.Stream`.
+  Extracts the underlying `Flow` pipeline from a `GRPC.Stream`.
 
   Raises an `ArgumentError` if the `flow` has not been initialized.