RFR: JDK-8315889: Open source several Swing HTMLDocument related tests [v2]

[Harshitha Onkar]

> Following tests are being open sourced as part of this PR.
> 
> javax/swing/text/html/HTMLDocument/4251593/bug4251593.java
> javax/swing/text/html/HTMLDocument/4687405/bug4687405.java
> javax/swing/text/html/HTMLDocument/4226914/bug4226914.java
> javax/swing/text/html/HTMLEditorKit/4213373/bug4213373.java

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  copyright year updated

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15687/files
  - new: https://git.openjdk.org/jdk/pull/15687/files/fa02522b..ed4b47d5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15687&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15687&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15687.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15687/head:pull/15687

PR: https://git.openjdk.org/jdk/pull/15687