Remove outdated FAQ_confidentiality TOC entry
Remove outdated FAQ_confidentiality TOC entry

content is outdated and covered in the
architecture FAQ.
[ci-skip]

Change-Id: I083d86dd8e2310404c5923ccf3950e303f9e3903
Signed-off-by: Nick Gaski <37a743b06b759d6e90b0bcef5abbfc458cb9f2d3@us.ibm.com>

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