Update docs/developer/style_guide.md

Co-authored-by: Riccardo Di Maio <[email protected]>

Author: voetberg

docs/developer/style_guide.md

@@ -251,7 +251,7 @@ and the second ensures the added types are consistent with the rest of the codeb
 
 
 # Docstring Style 
-Python Client documentation is autogenerated from docstrings, and need to follow a defined style. 
+Python Client documentation is autogenerated from docstrings, and needs to follow a defined style. 
 Client Docstrings use the `numpy` style, a [description of the style can be found here](https://numpydoc.readthedocs.io/en/latest/format.html)
 and [an example can be found here](https://www.sphinx-doc.org/en/master/usage/extensions/example_numpy.html).