This is a doc-only fix that improves the wording of the API doc of `getRequestHeaders()`. The other changes are trivial cleanup.
------------- Commit messages: - cleanup - Add note on multiple header fields - initial commit Changes: https://git.openjdk.java.net/jdk/pull/5100/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5100&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8272334 Stats: 27 lines in 1 file changed: 5 ins; 3 del; 19 mod Patch: https://git.openjdk.java.net/jdk/pull/5100.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/5100/head:pull/5100 PR: https://git.openjdk.java.net/jdk/pull/5100
