improve cold boot attacks documentation
Originally created by Tails on #6008 (Redmine)
See cold boot attacks.
- Make it more concise and neutral.
- Make it more scannable with respect to:
- emergency shutdown tools;
- memory wipe procedure.
- Mention the limitations of memory wipe (that is? probably a duplicate of what’s already mentioned on known issues
Feature Branch: doc/cold-boot-attack
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