Update the advanced logging example

[ubajze]

The original example can leak passwords if passwords are sent in a request body. This happens at login for example. We should mask passwords.

[bryanculver]

@ubajze Are there other places where passwords maybe logged? Say some things like golden config, etc? Reason I ask is that it might be helpful to show a before/after of the log message so if an administrator needs to extend this further, they can potentially understand better how mask_password sees the record message and is modifying it.

[ubajze]

@bryanculver I am pretty sure there are other places where passwords can be leaked. I updated the text a little bit.

[bryanculver]

@ubajze With the two suggestions above, I think this should be GTG.