Partial fix of OmitFromUsageDocs.
Partial fix of OmitFromUsageDocs.

This makes the code runnable, however, I think the desired effect of the
attribute is not fully functionnal.
Still need to understand how PowerArgs work to have a working fix.

BlackFrog1/PowerArgs,workabyte/PowerArgs,BlackFrog1/PowerArgs,adamabdelhamed/PowerArgs,adamabdelhamed/PowerArgs,workabyte/PowerArgs