Document Apache HTTP implementation namespaces

[jonathanpeppers]

Refs #301

Summary

• Document the unclaimed root, cookie, entity, and I/O Org.Apache.Http.Impl namespace summaries.
• Preserve Android Open Source Project CC BY 2.5 attribution for the AOSP-derived documentation.
• Leave Auth and Conn namespace files untouched because active PRs Document Apache HTTP authentication APIs #513 and Document Apache HTTP connection APIs #522 own them.

Sources

• Android 6.0 Apache HTTP client removal notice
• AOSP: org.apache.http.impl
• AOSP: org.apache.http.impl.cookie
• AOSP: org.apache.http.impl.entity
• AOSP: org.apache.http.impl.io

Validation

• Parsed all four changed XML files with PowerShell's System.Xml.XmlDocument.
• Confirmed CRLF-only line endings in every changed XML file.
• Ran git diff --check.
• Verified every referenced AOSP source URL returns HTTP 200.
• Confirmed the focused diff changes only four Org.Apache.Http.Impl namespace XML files.
• Scoped namespace placeholders: 6 -> 2; the remaining Auth and Conn placeholders belong to active PRs Document Apache HTTP authentication APIs #513 and Document Apache HTTP connection APIs #522.

[Copilot]

Pull request overview

This PR fills in previously placeholder namespace documentation for Org.Apache.Http.Impl and three of its sub-namespaces, adding concise summaries plus AOSP source links and CC BY 2.5 attribution consistent with other AOSP-derived docs in the repo.

Changes:

• Replaced To be added. placeholders with meaningful namespace <summary> text for Org.Apache.Http.Impl, .Cookie, .Entity, and .IO.
• Added <remarks> sections linking to the corresponding AOSP source directories.
• Preserved Android Open Source Project CC BY 2.5 attribution language in each updated namespace file.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/xml/ns-Org.Apache.Http.Impl.xml	Adds namespace summary and AOSP source/attribution remarks for the root Impl namespace.
docs/xml/ns-Org.Apache.Http.Impl.Cookie.xml	Documents the Impl.Cookie namespace summary and adds AOSP source/attribution remarks.
docs/xml/ns-Org.Apache.Http.Impl.Entity.xml	Documents the Impl.Entity namespace summary and adds AOSP source/attribution remarks.
docs/xml/ns-Org.Apache.Http.Impl.IO.xml	Documents the Impl.IO namespace summary and adds AOSP source/attribution remarks.

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[jonathanpeppers]

@dalexsoto review

[jonathanpeppers]

@dalexsoto review

[dalexsoto]

All four namespace summaries derive from Apache HttpComponents package documentation but attribute that material to AOSP under CC BY 2.5, misstating both provenance and license. Please use Apache Software Foundation / Apache License 2.0 attribution consistent with the corrected SSL namespace, retaining AOSP links only as source-location references.