OpenJDK 11: Merging java.util.regex.* 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: I16d8943d73905395e3d63e921c1500da0f26342f
3 files changed