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/inspect.rst b/Doc/library/inspect.rst
index bc4316f..300b3e7 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -556,7 +556,7 @@
       >>> sig.parameters['b'].annotation
       <class 'int'>
 
-   Accepts a wide range of python callables, from plain functions and classes to
+   Accepts a wide range of Python callables, from plain functions and classes to
    :func:`functools.partial` objects.
 
    Raises :exc:`ValueError` if no signature can be provided, and