Update debugger.md (#5210)

I noticed debugger.md still had a reference to project.json. This removes it.

Author: gregg-miskelly

debugger.md

@@ -41,7 +41,7 @@ VS Code needs to be configured so it understands how to build your project and d
 * Tasks.json is used to configure what command line command is executed to build your project, and launch.json configures the type of debugger you want to use, and what program should be run under that debugger. 
 * Launch.json configures VS Code to run the build task from tasks.json so that your program is automatically up-to-date each time you go to debug it.
 
-If you open the folder containing your project.json, the C# extension can automatically generate these files for you if you have a basic project. When you open a project and the C# extension is installed, you should see the following prompt in VS Code:
+If you open the folder containing your project, the C# extension can automatically generate these files for you if you have a basic project. When you open a project and the C# extension is installed, you should see the following prompt in VS Code:
 
 ![Info: Required assets to build and debug are missing from your project. Add them? Yes | Close](https://raw.githubusercontent.com/wiki/OmniSharp/omnisharp-vscode/images/info-bar-add-required-assets.png)