RFR: 8261168: Convert javadoc tool to use Stream.toList() [v3]

[Ian Graves]

> 8261168: Convert javadoc tool to use Stream.toList()

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Tweaking some comments and list/stream concatenation

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3612/files
  - new: https://git.openjdk.java.net/jdk/pull/3612/files/ac354293..0c2cf58a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3612&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3612&range=01-02

  Stats: 15 lines in 1 file changed: 5 ins; 4 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3612.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3612/head:pull/3612

PR: https://git.openjdk.java.net/jdk/pull/3612