Fix many pod2man errors

Julien,

Thank you for your excellent work regarding Google Safe Browsing API.

In the process of packaging Net::Google::SafeBrowsing2 for Debian and uploading it into the official distribution, I saw the following pod2man errors and had to fix them:

Now running lintian...
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2.3pm.gz:505
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::DBI.3pm.gz:226
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::Lookup.3pm.gz:236
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::MySQL.3pm.gz:223
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::Postgres.3pm.gz:210
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::Sqlite.3pm.gz:221
W: libnet-google-safebrowsing2-perl: manpage-has-errors-from-pod2man usr/share/man/man3/Net::Google::SafeBrowsing2::Storage.3pm.gz:660
Finished running lintian.

This patch fixes those errors.

Can you please pull this branch?

Regards,

PS: by the way, I opened an issue on the Python version that prevent me from uploading it into the official Debian distribution