[PATCH 4/5] docs: Document all the 'PW_' environment variables

[Finucane, Stephen]

On 12 Nov 06:05, Stephen Finucane wrote:
> These are found in multiple places across the code. It would be helpful
> to document them for the user.
> 
> Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>

Merged.