Change API doc example code to python3 style print (#22735)

As the title

Change API doc example code to python3 style print (#22735)
As the title
1b561da1 · Huihuang Zheng · GitHub · 882e7f7c · 1b561da1
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python/paddle/fluid/layers/control_flow.py python/paddle/fluid/layers/control_flow.py +1 -1

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--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -2400,7 +2400,7 @@ class IfElse(object):
        exe.run(fluid.default_startup_program())

        res = exe.run(fluid.default_main_program(), feed={"x":x_d, "y":y_d}, fetch_list=[out])
-        print res
+        print(res)
        # [array([-1.], dtype=float32)] 

    Args: