Add task expressions definition and link in F# 6 What's New

[Copilot]

Summary

Adds a proper definition of task expressions with a link to the full documentation in the "task {…}" section of the F# 6 What's New article.

Changes

Updated the introduction to the task {…} section to:

• Define what task expressions are for readers encountering them for the first time
• Link to the task expressions documentation for detailed information
• Clarify the relationship between task expressions and async expressions

Before

F# 6 includes native support for authoring .NET tasks in F# code. For example, consider...

After

F# 6 includes native support for authoring .NET tasks in F# code using [task expressions](../language-reference/task-expressions.md). Task expressions are similar to async expressions but allow you to author .NET tasks directly.

For example, consider...

Motivation

The original section introduced the task {…} syntax without defining what task expressions are or linking to their documentation. This left readers without a clear understanding of the feature or where to find more information.

Fixes #43686

Notes

• The existing code example using Async.StartAsTask is correct - it demonstrates the "before F# 6" approach that task expressions improve upon
• Follows Microsoft Writing Style Guide conventions
• Uses relative link format per documentation guidelines

Original prompt

---

This section details on the original issue you should resolve

<issue_title>More proper definition of task example</issue_title>
<issue_description>
[Enter feedback here]

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.
Async.StartAsTask should be Async.StartImmediateAsTask

• ID: e2dea170-a8f4-90f6-e578-e406fb43fef1
• Version Independent ID: 885f9f09-d2ff-112c-6dda-9a31bccc0e8a
• Content: What's new in F# 6 - F# Guide
• Content Source: docs/fsharp/whats-new/fsharp-6.md
• Product: dotnet-fsharp
• GitHub Login: @cartermp
• Microsoft Alias: dotnetcontent</issue_description>

Comments on the Issue (you are @copilot in this section)

@BillWagner To fix this, a definition for `task` expressions should be added, and it should link to this page: https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/task-expressions

Fixes #26890

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

---

Internal previews

📄 File	🔗 Preview link
docs/fsharp/whats-new/fsharp-6.md	docs/fsharp/whats-new/fsharp-6

[BillWagner]

This is ready for final review

[Copilot]

Pull Request Overview

This PR improves the F# 6 documentation by adding a proper definition of task expressions with a link to detailed documentation. The change addresses a gap where the "task {…}" feature was introduced without adequate explanation or reference material.

• Adds a clear definition of task expressions in the F# 6 What's New article
• Includes a link to the comprehensive task expressions documentation
• Clarifies the relationship between task expressions and async expressions