Update the script location comment in python-exec

Put the path matching new wrapping method in the comment.

Fixes: https://bugs.gentoo.org/show_bug.cgi?id=524342

Author: mgorny

src/python-exec.in

@@ -4,9 +4,9 @@
 # Released under the terms of the 2-clause BSD license.
 #
 # This is not the script you are looking for. This is just a wrapper.
-# The actual scripts of this application were installed with -python*,
-# -pypy* or -jython* suffixes. You are most likely looking for one
-# of those.
+# The actual scripts of this application were installed
+# in subdirectories of @PYTHON_SCRIPTROOT@.
+# You are most likely looking for one of those.
 
 from __future__ import with_statement
 import os, os.path, sys