Kacper Stojek 757cdba619 Documentation/external_docs.md: Add information about ost2
Add links to OpenSecurityTraining2 courses for newcommers

Signed-off-by: Kacper Stojek <kacper.stojek@3mdeb.com>
Change-Id: Ifd97996579576b35588fc0db42c16ee20d961760
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70853
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
2023-02-10 19:04:08 +00:00
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