[FAB-16885] Doc usage of salt for private data
[FAB-16885] Doc usage of salt for private data

Document the usage of salt for protecting private data.

Change-Id: I004d83f451a2d468f0b43aaf6ffaf61f56fd56b9
Signed-off-by: David Enyeart <3d699cfec69cc11a9ba1c3a1aef3260ab163489b@us.ibm.com>

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