hg: code-tools/jtreg: Fix broken links and other minor issues

[jonathan.gibbons at oracle.com]

Changeset: a2f3d8397e28
Author:    jjg
Date:      2018-08-10 11:58 -0700
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/a2f3d8397e28

Fix broken links and other minor issues

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