Add note about changing GPG directory.
Add note about changing GPG directory.

privacyidea/privacyidea,privacyidea/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea