hg: code-tools/jtreg: initial round of doc updates

[jonathan.gibbons at oracle.com]

Changeset: e73860d65556
Author:    jjg
Date:      2016-02-24 19:44 -0800
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/e73860d65556

initial round of doc updates

! src/share/doc/javatest/regtest/tag-spec.html