Spelling fix

Author: lnicola

editors/code/src/main.ts

@@ -253,7 +253,7 @@ async function getServer(context: vscode.ExtensionContext, config: Config, state
     await state.updateServerVersion(undefined);
     await vscode.window.showErrorMessage(
         "Unfortunately we don't ship binaries for your platform yet. " +
-        "You need to manually clone rust-analyzer repository and " +
+        "You need to manually clone the rust-analyzer repository and " +
         "run `cargo xtask install --server` to build the language server from sources. " +
         "If you feel that your platform should be supported, please create an issue " +
         "about that [here](https://github.com/rust-analyzer/rust-analyzer/issues) and we " +