code standard docs

Author: you-n-g

docs/developer/code_standard.rst

@@ -6,7 +6,7 @@ Code Standard
 
 Docstring
 =================================
-Please use the Numpy Style.
+Please use the `Numpydoc Style <https://stackoverflow.com/a/24385103>`_.
 
 Continuous Integration
 =================================
@@ -17,4 +17,4 @@ A common error is the mixed use of space and tab. You can fix the bug by inputin
 .. code-block:: python
 
     pip install black
-    python -m black . -l 120
+    python -m black . -l 120