Doco fixes/updates by ptn.
[git-p4: depot-paths = "//src/minitest/dev/": change = 8651]
Doco update by danieltdt.
[git-p4: depot-paths = "//src/minitest/dev/": change = 8652]
Added minitest-line to readme
[git-p4: depot-paths = "//src/minitest/dev/": change = 8653]