chore: update MediaElement docs to include custom http headers feature

[Kaaybi]

Adds documentation on MediaElement new feature custom http headers

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 493e3c0:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/maui/views/MediaElement.md	✅Succeeded	View

For more details, please refer to the build report.

[Kaaybi]

@microsoft-github-policy-service agree

[Copilot]

Pull request overview

Updates the .NET MAUI Community Toolkit MediaElement documentation to describe the new capability to send custom HTTP headers when playing remote media.

Changes:

• Added a new “Play remote media with custom HTTP headers” scenario section, including code samples.
• Documented the MediaSource.FromUri(Uri, IDictionary<string, string>) overload for passing HTTP headers.
• Expanded UriMediaSource description to mention the HttpHeaders property and its behavior.

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[jfversluis]

See comments, please double-check if this is all in order, exists and make sure the code is clear. Ideally ready to copy and paste for as much as possible.

The note about iOS and macOS is not super clear to me as AVURLAssetHTTPHeaderFieldsKey is never mentioned but I do need to watch out for it...?

[learn-build-service-prod]

Learn Build status updates of commit 43391ee:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/maui/views/MediaElement.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[Kaaybi]

Hi Gerald, thanks for reading through 🙏

See comments, please double-check if this is all in order, exists and make sure the code is clear. Ideally ready to copy and paste for as much as possible.

Fixed!

The note about iOS and macOS is not super clear to me as AVURLAssetHTTPHeaderFieldsKey is never mentioned but I do need to watch out for it...?

It was indeed ambiguous, I rephrased the sentence, is it clear enough now?