Update read docs

Author: Tyriar

src/vscode-dts/vscode.proposed.terminalShellIntegration.d.ts

@@ -35,7 +35,7 @@ declare module 'vscode' {
 		 * @example
 		 * // Log all data written to the terminal for a command
 		 * const command = term.shellIntegration.executeCommand({ commandLine: 'echo "Hello world"' });
-		 * const stream = command.readData();
+		 * const stream = command.read();
 		 * for await (const data of stream) {
 		 *   console.log(data);
 		 * }