Generate docs from `mediapipe/tasks/java`.
Generate docs from `mediapipe/tasks/java`.

The last CL used `mediapipe/java`, which is an old API. I've also added a flag to override the Java source location. This shouldn't be needed normally but makes local testing easier for both internal and external users.

PiperOrigin-RevId: 487704937

google/mediapipe,google/mediapipe,google/mediapipe,google/mediapipe,google/mediapipe,google/mediapipe,google/mediapipe,google/mediapipe