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Update getdata.rst

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@@ -127,7 +127,7 @@ For example, it looks quite long and complicated:
.. code-block:: python
>> from qlib.data import D
>> data = D.features(["sh600519"], ["(($high / $close) + ($open / $close)) * (($high / $close) + ($open / $close)) / ($high / $close) + ($open / $close)"], start_time="20200101")
>> data = D.features(["sh600519"], ["(($high / $close) + ($open / $close)) * (($high / $close) + ($open / $close)) / (($high / $close) + ($open / $close))"], start_time="20200101")
But using string is not the only way to implement the expression. You can also implement expression by code.