System.Span<T> F# snippets

[albert-du]

Adds F# snippets for Span and Span.Enumerator

[opbld31]

Docs Build status updates of commit 8ddcabd:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/fsharp/System/Span.Enumerator/Program.fs	✅Succeeded	View
snippets/fsharp/System/Span.Enumerator/Program2.fs	✅Succeeded	View
snippets/fsharp/System/Span.Enumerator/Program2/fs.fsproj	✅Succeeded
snippets/fsharp/System/Span.Enumerator/fs.fsproj	✅Succeeded
snippets/fsharp/System/Span/Overview/fs.fsproj	✅Succeeded
snippets/fsharp/System/Span/Overview/program.fs	✅Succeeded	View
snippets/fsharp/System/Span/Slice/Program.fs	✅Succeeded	View
snippets/fsharp/System/Span/Slice/Program2.fs	✅Succeeded	View
snippets/fsharp/System/Span/Slice/fs.fsproj	✅Succeeded
xml/System/Span`1+Enumerator.xml	✅Succeeded	View
xml/System/Span`1.xml	✅Succeeded	View

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[BillWagner]

Thanks again @albert-du

This looks great, and I'll now.