Add some more names for source-available software.

List "visible-source software" and "disclosed-source software" as
synonyms (h/t to Joseph Lorenzo Hall of CDT for the latter).  Also,
put a hyphen in the compound adjective "source-available".
Merge pull request #1 from OpenTechStrategies/gh-pages

Add some more names for source-available software.

Also made the change in my markdown version.