refine leaky_relu docs (#26558)

python/paddle/nn/functional/activation.py

@@ -419,7 +419,7 @@ def leaky_relu(x, negative_slope=0.01, name=None):
 
             paddle.disable_static()
 
-            x = paddle.to_tensor(np.array([-2, 0, 1]))
+            x = paddle.to_tensor(np.array([-2, 0, 1], 'float32'))
             out = F.leaky_relu(x) # [-0.02, 0., 1.]
 
     """

python/paddle/nn/layer/activation.py

@@ -625,7 +625,7 @@ class LeakyReLU(layers.Layer):
             paddle.disable_static()
 
             m = paddle.nn.LeakyReLU()
-            x = paddle.to_tensor(np.array([-2, 0, 1]))
+            x = paddle.to_tensor(np.array([-2, 0, 1], 'float32'))
             out = m(x)  # [-0.02, 0., 1.]
     """