- Improve wording and formatting (most notably, missing space before opening
  parenthesis) in some buggy option descriptions
- Standardize Makefile header when appropriate, drop one OPTIONS_DEFAULT=IPV6


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374788 35697150-7ecd-e111-bb59-0022644237b5
Allow jack to be upgraded when already installed. [1]
Move doxygen depend and docs out of DOCS option. [2]

PR:		195533 [1], 195573 [2]
Submitted by:	Mikhail T. <mi@ALDAN.algebra.com> [1], amdmi3@ [2]


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374789 35697150-7ecd-e111-bb59-0022644237b5