FreeBSD-related publications: correction, update

Fix a broken link (review D40951).

Hyphenation (FreeBSD-related, CD-ROMs).

Drag part of the page into the twenty-first century, through more
generic use of the phrase 'optical discs'.

Refrain from promoting the www@ mailto address for contact purposes.

Describe the Release Information page as such.

Other minor changes.

Differential-revision: https://reviews.freebsd.org/D40951