Update to r40905:

• fixes missing &os;, &linux; and incorrect <xref> tags
• general rewording to replace "you" and address redundancy
• removes deprecated apps: abacus, gimp-devel, guppi, konq-plugins and renames koffice to calligra
• incorporates redundant summary into synopsis
• fixes incorrect port/pkg names and adds localization notes where applicable
• moves some <sect2> to <sect3> as they make more sense as subsections
• rm openjdk compile as icedtea Makefile now does this for user
• bumps up some pkg/port versions
• adds some URLs to less known apps

Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D4101