[3.12] Remove Python 3.5 hardcoded version in the tutorial appendix (GH-117612) (GH-118707)

Remove Python 3.5 hardcoded version in the tutorial appendix (GH-117612)
(cherry picked from commit a855f82)

Co-authored-by: Kerim Kabirov <the.privat33r+gh@pm.me>

Author: miss-islington

Doc/tutorial/appendix.rst

@@ -40,7 +40,7 @@ Executable Python Scripts
 On BSD'ish Unix systems, Python scripts can be made directly executable, like
 shell scripts, by putting the line ::
 
-   #!/usr/bin/env python3.5
+   #!/usr/bin/env python3
 
 (assuming that the interpreter is on the user's :envvar:`PATH`) at the beginning
 of the script and giving the file an executable mode.  The ``#!`` must be the
@@ -107,7 +107,7 @@ of your user site-packages directory.  Start Python and run this code::
 
    >>> import site
    >>> site.getusersitepackages()
-   '/home/user/.local/lib/python3.5/site-packages'
+   '/home/user/.local/lib/python3.x/site-packages'
 
 Now you can create a file named :file:`usercustomize.py` in that directory and
 put anything you want in it.  It will affect every invocation of Python, unless