RFR: 8306980: Generated docs should contain correct GPLv2 Legal Documents [v3]

[KIRIYAMA Takuya]

> I modified the location from which javadoc copies some legal files to the generated documentation.  If --legal-notices　option is set to default or nothing is specified,, GPLv2 Legal Documents are copied from legal/java.base/ directory, such as LICENSE, ADDITIONAL_LICENSE_INFO and ASSEMBLY_EXCEPTION.
> 
> Would you please review this fix?

KIRIYAMA Takuya has updated the pull request incrementally with one additional commit since the last revision:

  8306980: Generated docs should contain correct GPLv2 Legal Documents

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13686/files
  - new: https://git.openjdk.org/jdk/pull/13686/files/acf1694c..ff2bf451

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13686&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13686&range=01-02

  Stats: 17 lines in 1 file changed: 10 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/13686.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13686/head:pull/13686

PR: https://git.openjdk.org/jdk/pull/13686