[Bug 265433] In geli section, add explanation to data integrity management

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265433

            Bug ID: 265433
           Summary: In geli section, add explanation to data integrity
                    management
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Books & Articles
          Assignee: doc@FreeBSD.org
          Reporter: clear.screen@orange.fr

In GELI section of handbook, the authentication feature should be more
documented, as data integrity stands with confidentiality in order to avoid
data corruption in uses cases which do not involve FS with specific features.

1) Add a dash in Section 18.13.2. "Disk Encryption with geli" with
authentication main feature (summary)

2) In procedure, present the use case and why integrity data checking is
essential versus confidentiality (some use case can also involve data
corruption because of hardware/software failure and not because of an attack).

One example with data integrity should be given.

NB : 
- Implication with aesni full software computation instead of accelerated
software should be explained.

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