Integrate changes cherry-picked for ticket #12005 into android_icu4j.

Changed numeric character references in API doc with raw code points,
so javadoc does not invalidate them in do clint.

Bug: 22023363

(cherry picked from commit 87a901bc03907f93227b639419364ac8befe9930)

Change-Id: I8c3ed8602dd639ce84f015f0624a6b0805e1efdb
3 files changed