fix typo

src/vs/vscode.d.ts

@@ -4909,7 +4909,7 @@ declare module 'vscode' {
 		/**
 		 * The extension kind describes if an extension runs where the UI runs
 		 * or if an extension runs where the remote extension host runs. The extension kind
-		 * if defined in the `package.json` file of extensions but can also be refined
+		 * is defined in the `package.json`-file of extensions but can also be refined
 		 * via the the `remote.extensionKind`-setting. When no remote extension host exists,
 		 * the value is [`ExtensionKind.UI`](#ExtensionKind.UI).
 		 */