[PATCH 0/1] YP overview manual: style improvements

["Michael Opdenacker" <michael.opdenacker@bootlin.com>]

I'm starting to read the YP manuals to better understand the
project and its resources.

This is also an opportunity to propose style updates, and
sometimes a more correct way of explaining some concepts.

Here are my first proposed improvements, this time
on the first part of the YP Overview Manual.

Note that this document was reviewed on an e-book reader
through Sphinx' "epub" export ("make epub"). Don't hesitate
to try this too, the output is pretty good, except for the graphics
that would need upscaling (at least in my case), but this
is another topic.

Thanks in advance for your reviews!

Michael.