Fixes #86655287 by adding code examples demonstrating common wildcard pattern usage in F#.

Changes Made

Enhanced the Wildcard Pattern section in docs/fsharp/language-reference/pattern-matching.md by adding a new F# code sample (snippet4818.fs) that demonstrates wildcard usage patterns:

• Function parameters: When _ is used in parameter lists, it ignores arguments entirely
• Data structure destructuring: When _ ignores specific elements that aren't needed
• Pattern matching: Using _ to ignore values in match expressions

Code Example

// Wildcard ignoring function parameters
let ignoreAllParams _ _ = "Ignores all input"

// Wildcard in destructuring, ignoring elements
let getFirstOnly (first, _) = first

// Using wildcard to ignore optional values
let handleEmpty opt =
    match opt with
    | Some _ -> "Has something"
    | None -> "Has nothing"

This addresses the gap in documentation referenced in dotnet/fsharp#1592 by providing additional examples of wildcard pattern usage, a commonly used feature in F# for ignoring unwanted values and parameters.

The changes maintain backward compatibility and follow existing documentation patterns while providing additional practical examples of the wildcard underscore _ pattern.

Fixes #20858

Fixes #20858

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