[AI] Add kdoc note about sending video and audio

[rlazo]

To send video and audio, the dev should call to both sendVideoRealtime and sendAudioRealtime

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[github-actions]

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add the 'no-changelog' label to the PR to silence this warning.)

Generated by 🚫 Danger

[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (89c3e53) and merge commit (68ac8be).

Test Logs

• Base (89c3e53): https://github.com/firebase/firebase-android-sdk/actions/runs/18697709193
• Merge (68ac8be): https://github.com/firebase/firebase-android-sdk/actions/runs/18722625581

1. https://storage.googleapis.com/firebase-sdk-metric-reports/GnqNXWWc8Z.html

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-ai

  Type	Base (89c3e53)	Merge (68ac8be)	Diff
  aar	1.04 MB	1.04 MB	-1 B (-0.0%)
  apk (release)	10.9 MB	10.9 MB	-32 B (-0.0%)

Test Logs

• Base (89c3e53): https://github.com/firebase/firebase-android-sdk/actions/runs/18697709193
• Merge (68ac8be): https://github.com/firebase/firebase-android-sdk/actions/runs/18722625581

1. https://storage.googleapis.com/firebase-sdk-metric-reports/OAL4fnb75f.html