message: Update index.js
  removed unneeded comments, switched to double quotes
diff: @@ -20,18 +20,15 @@ const onConnectEnd = (event) => console.log('on connect end', event);
  const CustomInput = () => (
  <>
  <div>Only connectable with B</div>
  - <Handle type="source" position="right" id='a' isValidConnection={isValidConnection} />
  - {/* <Handle type="source" position="right" id='a' /> */}
  + <Handle type="source" position="right" id="a" isValidConnection={isValidConnection} />
  </>
  );
  const CustomNode = ({ id }) => (
  <>
  <Handle type="target" position="left" isValidConnection={isValidConnection} />
  - {/* <Handle type="target" position="left" /> */}
  <div>{id}</div>
  <Handle type="source" position="right" isValidConnection={isValidConnection} />
  - {/* <Handle type="source" position="right" /> */}
  </>
  );
  