Add F#-friendly alternative suggestion to Azure Blob Storage documentation

[Copilot]

This PR adds a reference to the FSharp.Azure.Blob library as an F#-friendly alternative in the Azure Blob Storage F# documentation. The library provides a more idiomatic F# API for working with Azure Blob Storage compared to using the standard .NET Azure Storage Client Library directly.

Changes Made

• Added a NOTE-style alert about the FSharp.Azure.Blob library to docs/fsharp/using-fsharp-on-azure/blob-storage.md
• The alert is strategically placed after the introduction but before prerequisites to ensure visibility
• Includes a link to the FSharp.Azure.Blob repository
• Explains the benefits of using F#-specific patterns and functions for blob operations

This enhancement helps F# developers discover community-maintained tooling that can make Azure Blob Storage operations more natural and idiomatic in F# code, while preserving the existing tutorial content that demonstrates the standard .NET approach.

Fixes #20719.

Warning

https://api.github.com/repos/random82/FSharp.Azure.Blob

• Triggering command: curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

---

Internal previews

📄 File	🔗 Preview link
docs/fsharp/using-fsharp-on-azure/blob-storage.md	Get started with Azure Blob Storage using F#

[BillWagner]

@copilot I have one suggestion here for you to make.

[BillWagner]

This is ready for final review.