document the override of the complete config file

[jimk-bdrc]

The Shell Properties end-user documentation of Audit tool doesn't show that you can substitute a different properties config file on the command line.

Overriding the whole properties file is a potential strategy for buda-base/archive-ops#1044 so it should be documented.

[jimk-bdrc]

The MD file is correct, Run it through ghpages.