Manual page fixes from Anthony J. Bentley, with many thanks!

Addresses PR/48395

Use Mt for email addresses.

More markup, end sentence with dot.

Add pgp2ssh, a utility to retrieve PGP keys via HKP, and to store the keys
in ssh format. In combination with hkpd (using ssh key files), this utility
can be used to distribute ssh pubkey files to re

Add pgp2ssh, a utility to retrieve PGP keys via HKP, and to store the keys
in ssh format. In combination with hkpd (using ssh key files), this utility
can be used to distribute ssh pubkey files to remote computers using the
HKP protocol.

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