F# language docs with broken links

[gbaydin]

Issue description

Hello, I'm using F# and I've had difficulties in reading basic core language documentation over the last few weeks. A basic example is given below.

• For example, I go this site: https://docs.microsoft.com/en-us/dotnet/fsharp/
• then I want to learn about arrays. I go to "F# language reference" / "Arrays" in that site: https://docs.microsoft.com/en-us/dotnet/fsharp/language-reference/arrays
• then I want to learn about "Array.init" in that page and I click on it. It brings me to this other website https://msdn.microsoft.com/visualfsharpdocs/conceptual/array.init%5b%27t%5d-function-%5bfsharp%5d
• where if I click on anything on the left hand side to explore and learn more (e.g., Arrray.append) I get a "404 - Page not found".
  

I understand the website is moving (I saw a notice of "The site will be moving soon. This content will be permanently redirected" in msdn docs), but this has been like this for some significant time (weeks) and it's making basic language documentation unavailable for me and I had to learn basics without any documentation or searching elsewhere online.

I faced this 404 page about ten times over the last week.

@cartermp

Target framework

Check the .NET target framework(s) being used, and include the version number(s).

• .NET Core
• .NET Framework
• .NET Standard

If using the .NET Core SDK, include dotnet --info output. If using .NET Framework without the .NET Core SDK, include info from Visual Studio's Help > About Microsoft Visual Studio dialog.

dotnet --info output or About VS info

.NET Core SDK (reflecting any global.json):
 Version:   3.1.201
 Commit:    b1768b4ae7

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  20.04
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /usr/share/dotnet/sdk/3.1.201/

Host (useful for support):
  Version: 3.1.3
  Commit:  4a9f85e9f8

.NET Core SDKs installed:
  3.1.201 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.1.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

[dsyme]

Looks like the migration got out of sync, see #17199 for the overall issue covering the migration.

@cartermp is about to give his NDC Oslo talk, after he's done I'm hoping to help him on this

[cartermp]

I put out several PRs that should fix the issues mentioned here.

Not sure if it covers every link, but the most commonly-hit ones should be addressed by them: https://github.com/dotnet/docs/pulls/cartermp