[9] 8064562: (doc) errors in java.io.PushbackInputStream API documentation

[Brian Burkhalter]

Please review at your convenience.

Issue:  https://bugs.openjdk.java.net/browse/JDK-8064562
Patch:  http://cr.openjdk.java.net/~bpb/8064562/webrev.00/

Thanks,

Brian