Javadoc cleanup of IpSecManager API.

This changes only comments and annotations, which results
in minor API changes.

Bug: 63777932
Test: `make update-api` and visually inspect generated HTML.
Change-Id: I7a7a9244eade6cc55aca17a47e0a838cd6f84cc9
4 files changed
tree: dbf4951a7be16cc4dfa98fcba5a6f608853fd58d
  1. core/
  2. services/
  3. wifi/