[Repo Assist] Update fsdocs-tool to 22.0.0-alpha.3 (FSharp.Formatting 22.0.0-alpha.3) and SDK to .NET 10.0

[github-actions]

🤖 This is an automated PR from Repo Assist, created in response to issue #300.

Closes #300

Changes

• Updated fsdocs-tool from 21.0.0 to 22.0.0-alpha.3 in .config/dotnet-tools.json
• Updated global.json SDK version from 8.0.19 to 10.0.100 (fsdocs-tool 22.x targets .NET 10.0)
• Added a RELEASE_NOTES.md entry

Why the SDK bump?

fsdocs-tool 22.0.0-alpha.3 packages its tool binaries targeting net10.0. The .NET SDK enforces that a tool must be run by an SDK that understands its target framework. The existing 8.0.19 / rollForward: minor constraint prevented installation. Updating global.json to 10.0.100 (with rollForward: minor to allow 10.0.x patch updates) unblocks tool restore while keeping behavior predictable.

The library itself still targets netstandard2.0 and netstandard2.1, so consumers are unaffected.

Test Status

• ✅ dotnet tool restore — succeeds, fsdocs-tool 22.0.0-alpha.3 installed
• ✅ dotnet build FSharp.Control.AsyncSeq.sln -c Release — Build succeeded (4 pre-existing warnings, 0 errors)
• ✅ dotnet test FSharp.Control.AsyncSeq.sln -c Release — 372 passed, 0 failed

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