Update ABR docs

[ceyhun-o]

This PR updates the ABR docs and some API descriptions:

• targetBuffer is now correctly documented to be supported on all platforms.
• Adds preferredPeakBitRate to the ABR doc.
• Adds extra remarks for some ABR APIs.

[devin-ai-integration]

Thanks for the docs update, @ceyhun-o!

A table aligned, a footnote placed,
Old version notes now duly erased,
From Web and Android's domain,
iOS joins the ABR lane —
With THEOlive and Millicast embraced.

Code analysis:

The changes look clean. A few observations:

• Removing @platform web,android from strategy and replacing it with detailed @remarks is the right call — it correctly conveys that iOS support exists but is scoped to THEOlive/Millicast streams. The doc table's asterisk footnote matches.
• Removing the outdated v4.3.0 version-specific remarks from targetBuffer is good cleanup.
• The new Millicast connection-establishment caveat on both strategy and preferredPeakBitRate is helpful for developers.
• targetBuffer platform support updated from "Android & Web" → "Android/Web/iOS" in the doc table, consistent with the removal of the platform restriction.
• preferredPeakBitRate added to the doc table — was previously only in the TypeScript API docs.

One minor nit: there's a trailing space on line 122 of ABRConfiguration.ts (blank line between @platform ios and @remarks). Non-blocking.

CI: The iOS e2e failure ("dispatches a seeked event after seeking") is a preexisting flaky test — the same CI job also fails on recent develop PRs with different e2e tests (e.g. PR #850, #851).

CHANGELOG: Not needed — this is a docs-only PR.

Verdict: Ready to merge.