Update jax/experimental/jax2tf/README.md

Co-authored-by: Marc van Zee <marcvanzee@gmail.com>

jax/experimental/jax2tf/README.md

@@ -637,7 +637,7 @@ polymorphic_shapes = ["a, 2*a, b"]
 polymorphic_shapes = ["a * a, a"]
 ```
 
-Furthermore, in the native lowering the inputs that are not needed in the computation
+Furthermore, when native lowering the inputs that are not needed in the computation
 are ignored, so the dimension variables must be derivable only from used inputs.
 In the following example, the `x_unused` is not part of the computation so its
 input shapes cannot be used for deriving the dimension variables, and you will