Fix "Python" casing in a few places (GH-9001) (GH-9313)

(cherry picked from commit 271818fe279df5ab292789f97c3a52c477bd8f13)

Co-authored-by: Andrés Delfino <adelfino@gmail.com>
diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index 396853c..fb325ed 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -98,7 +98,7 @@
 .. note::
 
    When you nest patch decorators the mocks are passed in to the decorated
-   function in the same order they applied (the normal *python* order that
+   function in the same order they applied (the normal *Python* order that
    decorators are applied). This means from the bottom up, so in the example
    above the mock for ``module.ClassName1`` is passed in first.