Adapt /media paths in documentation to /media/amnesia for Jessie

In Jessie, user mount points will move from /media/* to /media/amnesia/. At least the TrueCrypt documentation mentions explicitly /media/something, and should be adapted. This needs testing to see if the mount points in /media/amnesia/ automatically appears in the Nautilus sidebar.

Parent Task: #7584 (closed)

Original created by @sajolida on 7919 (Redmine)

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