Since build/ was moved to build/make/, the droiddoc templates now need
another ../ to reach the android root.
Test: m online-sac-docs
Change-Id: I2393f6c791df9b67ccafb4eb047fd8ccc52481cb
openJdk based android javadoc contains <a name=... tags
that are non-empty. Currently they are being hidden,
causing badly formatted pages for some java.* classes
(missing text and random whitespace blocks).
This change makes the existing a[name] hiding rule
apply only to empty tags.
Test: make docs
Bug: 31700998
Change-Id: Ifa75bbabe308d7aed0cce6165c1113e5a382a121
(cherry picked from commit a7edd92c45)
