git: openjdk/doccheck: Bug fixes and minor cleanup

[Jonathan Gibbons]

Changeset: 5937a5d9
Author:    Jonathan Gibbons <jonathan.gibbons at oracle.com>
Date:      2021-09-03 17:05:58 +0000
URL:       https://git.openjdk.java.net/doccheck/commit/5937a5d9d8052ae69234bdfaa0587766b92008ba

Bug fixes and minor cleanup

! src/classes/doccheck/HtmlReporter.java
! src/classes/doccheck/Main.java
! src/classes/doccheck/html/ExtLinkChecker.java
! src/classes/doccheck/html/TidyChecker.java