docs(extraction): document audio sentence segments with asr_params (NVBug 6620974)

[kheiss-uwzoo]

Summary

• Fixes NVBug 6620974: the Concepts chunking bullet documented extract_audio_params={"segment_audio": True}, which GraphIngestor.extract_audio() rejects (AudioChunkParams extra-forbidden).
• Replaces that form with the supported API: asr_params=ASRParams(segment_audio=True) on .extract_audio(...), and points to the runnable example on Speech and audio extraction.
• Docs-only. A snippet-validation CI test from the bug's recommended fix is not in this PR; that belongs in a separate eng change.

Test plan

• Compare extract_audio() signature and ASRParams.segment_audio against graph_ingestor.py and common/params/models.py.
• Confirm audio-video.md already uses asr_params=ASRParams(..., segment_audio=True).
• Confirm extract_audio_params appears only as a rejected kwarg in test_ingest_interface.py.
• python -m mkdocs build --strict --config-file mkdocs.yml from docs/ (pass after excluding untracked leftover pages that are not in this diff).
• Reviewer: confirm the Concepts bullet matches the public Python API on current main.

pre-draft: leakage, mkdocs --strict, ::a, ::p, ::r on the diff vs main

Base: upstream/main
Files: docs/docs/extraction/concepts.md

Check	Result
Leakage (page roles + see [ CTAs)	PASS — no see [ CTAs; no nimOperator / nvcr.io/nim / installFfmpeg on concepts.md. Repo leakage script was not present; manual rg used.
Allowed paths	PASS — 1 documentation file
mkdocs --strict	PASS — exit 0 after excluding untracked leftover custom-metadata.md and user-defined-stages.md (those fail strict locally and are not in this diff). First local run aborted with 4 leftover-page warnings.
::a audit	PASS — 1 changed claim; extract_audio(asr_params=ASRParams(segment_audio=True)) matches graph_ingestor.py:645-656, ASRParams.segment_audio in models.py:405, and test_audio_pipeline_batch.py:99-108 (95%)
::p polish	none needed — one-line glossary API correction; did not restructure Concepts
::r style	95% — no blocking issues on the changed sentence (refer to, code in backticks, descriptive link, periods)

Code drift (not in this docs PR): none for this claim. The bug also recommended a documentation contract test that executes or signature-validates public Python snippets; that is eng/CI work and stays out of this docs PR.

PR: #2612