[TRAX] Resolution for Github #820 - Make `q_info` and `kv_info` in `attend` 1-indexed, instead of 0-indexed.
[TRAX] Resolution for Github #820 - Make `q_info` and `kv_info` in `attend`
1-indexed, instead of 0-indexed.

PiperOrigin-RevId: 325642426

google/trax,google/trax