Update text that reference old options

Author: DustinCampbell

src/omnisharp/server.ts

@@ -411,7 +411,7 @@ export abstract class OmnisharpServer {
 				return omnisharp.findServerPath(options.path).then(serverPath => {
 					return resolve(serverPath);
 				}).catch(err => {
-					vscode.window.showWarningMessage(`Invalid "csharp.omnisharp" user setting specified ('${options.path}).`);
+					vscode.window.showWarningMessage(`Invalid value specified for "omnisharp.path" ('${options.path}).`);
 					return reject(err);
 				});
 			}
@@ -429,9 +429,9 @@ export abstract class OmnisharpServer {
 				this._channel.appendLine("    1. If it's not already installed, download and install Mono (https://www.mono-project.com)");
 				this._channel.appendLine("    2. Download and untar the latest OmniSharp Mono release from  https://github.com/OmniSharp/omnisharp-roslyn/releases/");
 				this._channel.appendLine("    3. In Visual Studio Code, select Preferences->User Settings to open settings.json.");
-				this._channel.appendLine("    4. In settings.json, add a new setting: \"csharp.omnisharp\": \"/path/to/omnisharp/OmniSharp.exe\"");
-				this._channel.appendLine("    4. In settings.json, add a new setting: \"csharp.omnisharpUsesMono\": true");
-				this._channel.appendLine("    5. Restart Visual Studio Code.");
+				this._channel.appendLine("    4. In settings.json, add a new setting: \"omnisharp.path\": \"/path/to/omnisharp/OmniSharp.exe\"");
+				this._channel.appendLine("    5. In settings.json, add a new setting: \"omnisharp.useMono\": true");
+				this._channel.appendLine("    6. Restart Visual Studio Code.");
 				this._channel.show();
 
 				throw err;