Merge #7198 doc fix.

Tools/demo/README

+This directory contains a collection of demonstration scripts for
+various aspects of Python programming.
+
+beer.py        Well-known programming example: Bottles of beer.
+eiffel.py      Python advanced magic: A metaclass for Eiffel post/preconditions.
+hanoi.py       Well-known programming example: Towers of Hanoi.
+life.py        Curses programming: Simple game-of-life.
+markov.py      Algorithms: Markov chain simulation.
+mcast.py       Network programming: Send and receive UDP multicast packets.
+queens.py      Well-known programming example: N-Queens problem.
+redemo.py      Regular Expressions: GUI script to test regexes.
+rpython.py     Network programming: Small client for remote code execution.
+rpythond.py    Network programming: Small server for remote code execution.
+sortvisu.py    GUI programming: Visualization of different sort algorithms.
+ss1.py         GUI/Application programming: A simple spreadsheet application.
+vector.py      Python basics: A vector class with demonstrating special methods.
\ No newline at end of file