OpenJDK 11: Merging java.nio.channel.spi.* trivial changes

This is a part of merging upstream changes from OpenJDK 11.28. It
updates classes with trivial changes (most of them are javadoc
changes).

Bug: 198640665
Test: m droid
Change-Id: Icd9e96e423a57dbbcddb2066b02b08bdf8f951b6
5 files changed