x86: deduplicate the spectre_v2_user documentation

This would need updating to make prctl be the new default, but it's
simpler to delete it and refer to the dup.

Fixes: 6b3e64c237c0 ("x86/speculation: Add seccomp Spectre v2 user space protection mode")
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
1 file changed