Fix apache#13013, Fix Sphinx python docstring error. (apache#13173)

python/mxnet/ndarray/contrib.py

@@ -140,9 +140,9 @@ def foreach(body, data, init_states):
     NDArrays.
 
     body takes two arguments as input and outputs a tuple of two elements,
-    as illustrated below:
+    as illustrated below::
 
-    out, states = body(data1, states)
+        out, states = body(data1, states)
 
     data1 can be either an NDArray or a list of NDArrays. If data is an NDArray,
     data1 is an NDArray. Otherwise, data1 is a list of NDArrays and has the same
@@ -152,15 +152,15 @@ def foreach(body, data, init_states):
     are the second output of foreach.
 
     The computation done by this operator is equivalent to the pseudo code below
-    when the input data is NDArray:
-
-    states = init_states
-    outs = []
-    for i in data.shape[0]:
-        s = data[i]
-        out, states = body(s, states)
-        outs.append(out)
-    outs = stack(*outs)
+    when the input data is NDArray::
+
+        states = init_states
+        outs = []
+        for i in data.shape[0]:
+            s = data[i]
+            out, states = body(s, states)
+            outs.append(out)
+        outs = stack(*outs)
 
 
     Parameters