Update extensions.json

Author: AArnott

.vscode/extensions.json

@@ -5,14 +5,14 @@
 	// List of extensions which should be recommended for users of this workspace.
 	"recommendations": [
 		"ms-azure-devops.azure-pipelines",
-		"ms-vscode.csharp",
+		"ms-dotnettools.csharp",
 		"k--kato.docomment",
 		"editorconfig.editorconfig",
 		"pflannery.vscode-versionlens",
 		"davidanson.vscode-markdownlint"
 	],
 	// List of extensions recommended by VS Code that should not be recommended for users of this workspace.
 	"unwantedRecommendations": [
-		
+
 	]
-}
+}