documentation for bug 903

[Daniel Kahn Gillmor]

a couple years ago, bug 903 was resolved, including the possibility to
document calculated validity in the --photo-viewer output.

  https://bugs.g10code.com/gnupg/issue903

however, this was never documented in the man pages.

The attached patch should update the documentation to reflect the
functionality.

Thanks,

	--dkg
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