Update Numpy Docs link in learn.md (#402)

Author: joelachance

content/en/learn.md

@@ -3,7 +3,7 @@ title: Learn
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-**The official NumPy documentation lives [here](https://numpy.org/doc/stable).**
+For the **official NumPy documentation** visit [numpy.org/doc/stable](https://numpy.org/doc/stable).
 
 Below is a curated collection of external resources. To contribute, see the [end of this page](#add-to-this-list).
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