evolve: improve the help of the fold command
The help of the fold command needed a little rework. This patch makes it a
little less verbose and adds an example. It also highlights a little more the
importance of the --exact flag.
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico