RFR: 8268664: The documentation of the Scanner.hasNextLine is incorrect

[Ian Graves]

8268664: The documentation of the Scanner.hasNextLine is incorrect

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Commit messages:
 - Clarifying docs on Scanner.hasNextLine() regarding line separators

Changes: https://git.openjdk.java.net/jdk/pull/4547/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4547&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268664
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4547.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4547/head:pull/4547

PR: https://git.openjdk.java.net/jdk/pull/4547