Reword about.rst to not limit Sphinx (pythonGH-128325)

(cherry picked from commit c5438fd)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

Doc/about.rst

@@ -1,10 +1,11 @@
-=====================
-About these documents
-=====================
+========================
+About this documentation
+========================
 
 
-These documents are generated from `reStructuredText`_ sources by `Sphinx`_, a
-document processor specifically written for the Python documentation.
+Python's documentation is generated from `reStructuredText`_ sources
+using `Sphinx`_, a documentation generator originally created for Python
+and now maintained as an independent project.
 
 .. _reStructuredText: https://docutils.sourceforge.io/rst.html
 .. _Sphinx: https://www.sphinx-doc.org/
@@ -20,14 +21,14 @@ volunteers are always welcome!
 Many thanks go to:
 
 * Fred L. Drake, Jr., the creator of the original Python documentation toolset
-  and writer of much of the content;
+  and author of much of the content;
 * the `Docutils <https://docutils.sourceforge.io/>`_ project for creating
   reStructuredText and the Docutils suite;
 * Fredrik Lundh for his Alternative Python Reference project from which Sphinx
   got many good ideas.
 
 
-Contributors to the Python Documentation
+Contributors to the Python documentation
 ----------------------------------------
 
 Many people have contributed to the Python language, the Python standard