JDK 9 RFR of 8177526: BufferedReader readLine() javadoc does not match the implementation regarding EOF

[Brian Burkhalter]

Please review this doc-only change at your convenience.

Issue:  https://bugs.openjdk.java.net/browse/JDK-8177526
Patch:  http://cr.openjdk.java.net/~bpb/8177526/webrev.00/

Thanks,

Brian