DOC: Fix typo in developer's guide (pandas-dev#52356)

Fix typo in developer's guide

Author: assafam

doc/source/development/contributing.rst

@@ -349,7 +349,7 @@ If using :ref:`mamba <contributing.mamba>`, do::
 If using :ref:`pip <contributing.pip>` , do::
 
     # activate the virtual environment based on your platform
-    pythom -m pip install --upgrade -r requirements-dev.txt
+    python -m pip install --upgrade -r requirements-dev.txt
 
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