Document that Tails installed using dd is not seen as a bootable device on some MacBook Pro

See #12146 (closed) and more recently #15021 (closed): we’ve known for about a year about this, but apparently our install doc still recommends a path we know won’t work on some Macs. I didn’t check if our troubleshooting doc did take this problem into account.

Feature Branch: doc/15025-not-detected-on-mac

Parent Task: #12146 (closed)

Related issues

Related to #15021 (closed)
Related to #15325 (closed)
Blocks #15941 (closed)

Original created by @intrigeri on 15025 (Redmine)

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