repo "about" link points to faulty page

The "about" paragraph of this repo points to https://dotnet.microsoft.com/languages/fsharp
The first example on that page is just plain wrong.
```
// 'name' is inferred to be a string based on usage.
let printMessage name =
printfn $"Hello there, {name}!"
```

I would provide a PR, but it looks like the source of that page is not open source.

Start by checking the repository's About paragraph and opening the linked F# page to verify the reported example. Confirm whether the link target or its source can be changed; this is done when the repository no longer directs users to the faulty page, or the external documentation owner has been identified.

Written by the indexing model from the issue text.