message: Update Maven docs to reflect the current package configuration.
diff: Tink Java has 4 Maven artifacts, all are in the `com.google.crypto.tink` group.
  -- `tink`: this is the core of Tink built for server side apps. It only depends
  - on `org.json:json` and `com.google.protobuf:protobuf-java`.
  -- `tink-android`: this is similar to `tink` but is built for Android apps. It
  - only depends on `com.google.protobuf:protobuf-lite`.
  -- `tink-awskms`: this is a plugin for the `tink` artifact that integrates Tink
  - with AWS KMS.
  -- `tink-gcpkms`: this is a plugin for the `tink` artifact that integrates Tink
  - with GCP KMS.
  +### `tink`
  +
  +The core of Tink built for server-side applications. It only depends on
  +[`org.json:json`](https://search.maven.org/artifact/org.json/json) and
  +[`com.google.protobuf:protobuf-java`](https://search.maven.org/artifact/com.google.protobuf/protobuf-java).
  +
  +### `tink-android`
  +
  +Similar to `tink` but is built for Android applicationss.
  +
  +This build includes an embeded copy
  +[`com.google.protobuf:protobuf-lite`](https://search.maven.org/artifact/com.google.protobuf/protobuf-javalite),
  +which is renamed to be `com.google.crypto.tink.shaded.protobuf`. This is done to
  +avoid dependency conflicts with other common dependencies that depend on a
  +conflicting version (e.g. Firebase).
  +
  +### `tink-awskms`
  +
  +A plugin for the `tink` artifact that integrates Tink with AWS KMS.
  +
  +### `tink-gcpkms`
  +
  +A plugin for the `tink` artifact that integrates Tink with GCP KMS.
  ## Publishing snapshots
  @@ -20,8 +35,8 @@ Tink Java has 4 Maven artifacts, all are in the `com.google.crypto.tink` group.
  This command publishes latest snapshots to Maven, and their Javadocs to
  https://google.github.com/tink.
  -Snapshots are also automatically published for every new commit to
  -the master branch of https://github.com/google/tink.
  +Snapshots are automatically published for every new commit to the master branch
  +of https://github.com/google/tink.
  ## Testing snapshots
  