Document no-allow-mark-trusted option
doc: Document no-allow-mark-trusted for gpg-agent * doc/gpg-agent.texi: Change allow-mark-trusted doc to no-allow-mark-trusted. -- Since rev. 78a56b14 allow-mark-trusted is the default option and was replaced by no-allow-mark-trusted to disable the interactive prompt.
- Signed-off-by: Andre Heinecke <aheinecke@intevation.de>