Replace .NET Framework with .NET (C# folders)

[gewarren]

Replace .NET Framework with .NET (where appropriate) in docs/csharp folders.

Folders:

• csharp/getting-started
• csharp/how-to
• csharp/language-reference
• csharp/linq
• csharp/programming-guide
• csharp/roslyn-sdk
• csharp/tour-of-csharp
• csharp/tutorials
• csharp/whats-new

[ossCodeJourney]

I want to work on this. Should i get my name added to the contributors list in order to do so. First timer, please excuse if the question is silly.

[gewarren]

@ossCodeJourney Thanks for your help! No need to get your name added as a contributor, you can just go ahead and submit a pull request when you're ready. It will probably ask you to sign a contributor's license agreement once you submit the PR.