Remove F# examples where no API signature in F#

[gewarren]

Fixes #12542

[Copilot]

Pull request overview

This PR updates the .NET API reference XML docs to remove F# snippet includes in example blocks for members that don’t have an F# API signature, keeping the displayed examples aligned with the available language signatures on the rendered docs pages.

Changes:

• Removed :::code language="fsharp" directives from multiple constructor/member example blocks where an F# signature isn’t present.
• Kept C# and VB examples intact while trimming F# in the affected locations.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
xml/System/Random.xml	Removes F# snippet include from the parameterless constructor example.
xml/System/Lazy`1.xml	Removes F# snippet includes from parameterless constructor example blocks.
xml/System/FlagsAttribute.xml	Removes F# snippet includes from constructor examples.
xml/System/Exception.xml	Removes F# snippet include from parameterless constructor example.
xml/System/Attribute.xml	Removes F# snippet include from the protected constructor example.
xml/System/ArrayTypeMismatchException.xml	Removes F# snippet include from parameterless constructor example.
xml/System.Timers/Timer.xml	Removes F# snippet include from parameterless constructor example.
xml/System.Text/StringBuilder.xml	Removes F# snippet include from parameterless constructor example.
xml/System.Security.Cryptography/Aes.xml	Removes F# snippet include from the protected constructor example block.
xml/System.Net.NetworkInformation/PingOptions.xml	Removes F# snippet include from parameterless constructor example block.
xml/System.Collections.Generic/Stack`1.xml	Removes F# snippet include from parameterless constructor example block.
xml/System.Collections.Generic/SortedList`2.xml	Removes F# snippet include from parameterless constructor example block.
xml/System.Collections.Generic/List`1.xml	Removes F# snippet include from parameterless constructor example block.
xml/System.Collections.Generic/HashSet`1.xml	Removes F# snippet include from parameterless constructor example block.
xml/System.Collections.Generic/Dictionary`2.xml	Removes F# snippet include from parameterless constructor example block.

[davidle-ms]

LGTM