[Bug 205829] documenting disabling ctrl-alt-space suspend feature

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205829

            Bug ID: 205829
           Summary: documenting disabling ctrl-alt-space suspend feature
           Product: Documentation
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: dweber at htwsaar.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I've been repeatedly bitten by accidently pressing alt+space when holding ctrl,
mostly when switching between GUI tty and console tty

Setting hw.acpi.suspend_state to NONE seems to be the right solution to disable
the suspend feature.

While hw.acpi.suspend_state is documented in acpi(4), hw.acpi.suspend_state is
not. 

I propose the following change but am unsure whether it reflects the behaviour
accurately:

hw.acpi.suspend_state
             Suspend state (S1-S5) to enter when ctrl-alt-space is pressed.
             Default is S3 (suspend to RAM).

Is the default S3 correct? At least on my systems...

Are there other situations affected by this sysctl apart from ctrl-alt-space?

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