Add multiple cons pattern example to F# pattern matching documentation

[Copilot]

Fixes #[issue-number]

Summary

This PR adds documentation for chaining multiple cons patterns together in F# pattern matching, addressing a gap in the existing documentation.

Changes

Added a new example demonstrating how to use multiple cons patterns consecutively to match lists that start with specific sequences of elements. This is a useful pattern that was previously undocumented.

Before: The documentation only showed the basic cons pattern (head :: tail) for decomposing a list into its first element and remaining elements.

After: The documentation now includes an example showing how to chain cons patterns:

match xs with
| 'A'::'B'::t -> "starts with 'AB'"
| 'A'::t -> "starts with 'A'"
| 'C'::'D'::t -> "starts with 'CD'"

This pattern is particularly useful when you need to match lists based on their first few elements, providing a more elegant alternative to using list patterns with fixed lengths.

Files Changed

• docs/fsharp/language-reference/pattern-matching.md - Added explanatory text and reference to new code snippet
• samples/snippets/fsharp/lang-ref-2/snippet4819.fs - New runnable example demonstrating multiple cons patterns

The example code has been tested and verified to compile and run correctly with F# Interactive.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Include multiple cons sample</issue_title>
<issue_description>
[Enter feedback here]
For the cons pattern matching section, a very useful construct that should be included in the documentation is the multiple cons pattern:

match xs with
| 'A'::'B'::t -> "starts with 'AB'"
| 'A'::t -> "starts with 'A'"
| 'C'::'D'::t -> "starts with 'CD'"

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 8a3ed054-03c9-375f-403b-68f0356d5870
• Version Independent ID: 3c167003-13e8-359b-e919-693258e7f48b
• Content: Pattern Matching - F#
• Content Source: docs/fsharp/language-reference/pattern-matching.md
• Product: dotnet-fsharp
• GitHub Login: @cartermp
• Microsoft Alias: dotnetcontent</issue_description>

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

Fixes #28742

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Internal previews

📄 File	🔗 Preview link
docs/fsharp/language-reference/pattern-matching.md	docs/fsharp/language-reference/pattern-matching

[BillWagner]

This is ready for final review

[Copilot]

Pull Request Overview

This PR enhances the F# pattern matching documentation by adding an example for chaining multiple cons patterns together, addressing a gap in the existing documentation where only basic cons patterns were demonstrated.

• Adds documentation and example showing how to chain cons patterns like 'A'::'B'::t
• Creates a new runnable code snippet demonstrating practical usage
• Provides better coverage of cons pattern capabilities in F# pattern matching

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/fsharp/language-reference/pattern-matching.md	Adds explanatory text and reference to new code snippet for multiple cons patterns
samples/snippets/fsharp/lang-ref-2/snippet4819.fs	Creates new runnable example demonstrating chained cons pattern matching

Comments suppressed due to low confidence (1)

docs/fsharp/language-reference/pattern-matching.md:1

• Missing AI usage disclosure. Add the ai-usage: ai-assisted frontmatter key/value pair to indicate this content was created with AI assistance.

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