Add javadoc for Network#netId

Bug: 151156820
Test: m doc-comment-check-docs
Change-Id: Iea34a5c58a8b77c83258a39a8a44601e21a482f5
1 file changed
tree: 79b8fdacfffcb305d089e7046ade8cfdce34a530
  1. core/
  2. services/
  3. tests/