[Repo Assist] Add regression test: type with same name as namespace appears in API docs (issue #944)

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Closes #944

Problem

Issue #944 reports that types whose name equals their enclosing namespace (e.g., type AvalonLog.AvalonLog inside namespace AvalonLog) are missing from generated API documentation. No one has confirmed whether this was ever fixed or is environment-specific.

What This PR Does

1. Adds a minimal test library tests/FSharp.ApiDocs.Tests/files/SameNameLib/ with:

   • A single F# file declaring namespace SameNameLib and type SameNameLib(value: string)
   • A project file targeting netstandard2.1 (matching other test libraries)

2. Adds a regression test ApiDocs includes type whose name matches its namespace (issue 944) that:

   • Loads SameNameLib.dll through ApiDocs.GenerateModel
   • Asserts the SameNameLib namespace is present
   • Asserts the SameNameLib type is present within that namespace
   • Asserts the URL base name for the type is non-empty (confirming it has a distinct page URL)

Findings

The test passes on the current codebase — meaning the bug reported in #944 is not present in the current version of FSharp.Formatting. This could mean:

• The bug was fixed incidentally by a previous change, or
• It was specific to the user's environment / library structure (e.g., a C# library or a particular F# pattern)

Either way, the test now serves as a regression guard: if a future change accidentally breaks same-name entity handling, CI will catch it.

Test Status

• ✅ Build: dotnet build FSharp.Formatting.sln --configuration Release — succeeded (0 errors, 1 pre-existing FS0760 warning)
• ✅ Tests: 88 passed, 4 skipped, 0 failed (was 87 before; +1 new test)
• ✅ Format: dotnet fantomas tests/FSharp.ApiDocs.Tests/ApiDocsTests.fs — applied, no further changes needed

Files Changed

File	Change
tests/FSharp.ApiDocs.Tests/files/SameNameLib/SameNameLib.fsproj	New test library project
tests/FSharp.ApiDocs.Tests/files/SameNameLib/Library.fs	New: type SameNameLib inside namespace SameNameLib
tests/FSharp.ApiDocs.Tests/FSharp.ApiDocs.Tests.fsproj	Add ProjectReference to SameNameLib
FSharp.Formatting.sln	Add SameNameLib project to solution
tests/FSharp.ApiDocs.Tests/ApiDocsTests.fs	Add regression test
RELEASE_NOTES.md	Add entry under [Unreleased]

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