[docs] [issue7061] Improve 24.5. turtle doc

Éric Araujo <merwok@netwok.org> added the comment: “Python” is lower-cased only when referring to the executable (as a file) itself. When talking about the language, the implementation or the VM in an abstract way (not a file), It think it’s always “Python”. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue7061> _______________________________________