[LTP] [PATCH v2] doc: Modernize test-writing-guidelines

[Petr Vorel]

Hi Cyril,

Reviewed-by: Petr Vorel <pvorel@suse.cz>

LGTM.

> -1.2 Code duplication
> -~~~~~~~~~~~~~~~~~~~~
> +* Do not write Makefiles from scratch, use LTP build system instead
> +
> +* Etc.
> +
> +
nit: sometimes you use 2 blank lines at the end of the chapter, sometimes just one.
> +1.2 Keep functions and variable names short
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kind regards,
Petr