Bug#919284: libfreetype6-dev: Please suggest instead of recommend freetype2-doc

[Jeremy Bicha]

Package: libfreetype6-dev
Version: 2.9.1-3

I think it's more common in Debian for -dev packages to Suggest their
-doc package.

Please consider demoting libfreetype6-dev's Recommends: freetype2-doc
to a Suggests.

Thanks,
Jeremy Bicha