docs(provenance): update explanation of new GnuPG format (#4710)
docs(provenance): update explanation of new GnuPG format (#4710)

Signed-off-by: Matt Butcher <9edef9357d0bb3cf7fbdee24829bb01e8827bfb3@microsoft.com>
jascott1/helm,appscode/helm,SlickNik/helm,SlickNik/helm,appscode/helm,jascott1/helm