Documentation/northbridge/intel/sandybridge/*: fix typos

Fix some words' spelling and rename "Sandybridge" and "Ivybridge" in
text (not filepaths) to match Intel's names "Sandy Bridge" and "Ivy
Bridge".

Change-Id: Ic77126ccaf1d3ec5530a35d1a0f7d2ea5e174c9a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/28231
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
4 files changed