Documentation: Update coding_style.md with refactoring section

The rule being added to the refactoring section is already present
in the "coding style" section of the guide, but is currently easy
to miss.  Adding it to its own section makes it a little more plain
and makes it more strongly worded.

Update a couple of other areas:
- Make kernel specific phrasing better aligned with coreboot.
- Remove duplicate "try to match" phrase in coding style section.
- Remove section on Data structures - it doesn't apply to coreboot.
- Update text to make it clearer and more coreboot-centric.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ic3508529f639ea0609d2ea2032cc52407e9543e5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71067
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

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