Include activations in Sequential example.

flax/linen/combinators.py

@@ -19,13 +19,14 @@ class Sequential(Module):
   Example usage::
 
     class Foo(nn.Module):
-        feature_sizes: Sequence[int]
-
-        @nn.compact
-        def __call__(self, x):
-        return nn.Sequential([nn.Dense(layer_size, name=f'layers_{idx}')
-                              for idx, layer_size
-                              in enumerate(self.feature_sizes)])(x)
+      feature_sizes: Sequence[int]
+
+      @nn.compact
+      def __call__(self, x):
+        return nn.Sequential([nn.Dense(4),
+                              nn.relu,
+                              nn.Dense(2),
+                              nn.log_softmax])(x)
   """
   layers: Sequence[Callable]