Document AndroidMessageHandler redirects

[jonathanpeppers]

Refs #278

Documents redirect handling without expanding into implementation-specific placeholder members.

Sources

• https://github.com/dotnet/android/blob/main/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs
• https://developer.android.com/reference/java/net/HttpURLConnection#setInstanceFollowRedirects(boolean)

Validation

• Parsed all 6 docs/xml/Xamarin.Android.Net/*.xml files with System.Xml.XmlReader.
• Verified 0 lone LF bytes in docs/xml/Xamarin.Android.Net.
• Ran git diff --check.

[Copilot]

Pull request overview

This PR updates the Xamarin.Android.Net API XML documentation to describe redirect-related behavior on Xamarin.Android.Net.AndroidMessageHandler, replacing “To be added.” placeholders with concrete documentation.

Changes:

• Documented AllowAutoRedirect to describe redirect-following behavior and its default value.
• Documented SupportsRedirectConfiguration to explain support for redirect configuration via related properties.

Suppressed comments (1)

docs/xml/Xamarin.Android.Net/AndroidMessageHandler.xml:943

• This property’s block drops the and elements, which makes it inconsistent with the rest of the properties in this file and may produce incomplete property documentation output.

          Gets a value indicating whether the handler supports configuration settings for the
          <see cref="P:Xamarin.Android.Net.AndroidMessageHandler.AllowAutoRedirect" /> and
          <see cref="P:Xamarin.Android.Net.AndroidMessageHandler.MaxAutomaticRedirections" /> properties.
          Always returns <c>true</c> for <see cref="T:Xamarin.Android.Net.AndroidMessageHandler" />.
        </summary>

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[jonathanpeppers]

@dalexsoto review

[jonathanpeppers]

@dalexsoto review

[dalexsoto]

The property documentation structure is fixed, but both new remarks point readers to HttpURLConnection.InstanceFollowRedirects even though AndroidMessageHandler always disables Java redirect handling and implements redirects itself through AllowAutoRedirect and MaxAutomaticRedirections. Please remove those links or explicitly explain the managed redirect mechanism: AndroidMessageHandler.xml.