OpenJDK 11: Merging java.net.* trivial changes

This is a part of merging upstream changes from OpenJDK 11.0.24. It
updates classes with trivial changes (most of them are javadoc
changes).

Bug: 198640665
Test: m
Change-Id: If542eac43e26405eb0d2179c21be0a2e011e5a8f
26 files changed